The muscle that crosses from inside to outside
Ida's first claim about the piriformis is geometric, not muscular. Every other deep rotator of the hip — the obturators, the gemelli, the quadratus femoris — originates inside the pelvic bowl on the obturator membrane or on the ischium and inserts laterally on the greater trochanter. The piriformis alone reaches farther in. Its origin is on the anterior surface of the sacrum, the part of the pelvis no hand can directly touch. By working its lateral insertion at the trochanter, the practitioner is, in effect, putting tension on a structure attached to the front face of the sacrum from the outside of the body. This is the geometric fact Ida returned to in classroom after classroom, and the one she insisted students name before she would let them proceed. In her August 1975 Boulder advanced class, with Bill spelling out the anatomy of the five rotators on her behalf, she pressed her students past the names and toward the strategic point.
"with the piriformis is the only one of the rotators that attach to the anterior part of the sacrum. It's the only thing that's on the outside of that body that goes to the inside of the body."
Ida names what makes piriformis structurally unique among the rotators:
What Ida wants the students to grasp is not that the piriformis is special as a muscle but that it is special as a piece of leverage. She generalized the point a moment later: the rotators as a group are valuable because one end of them is accessible and the other end does work in places the hand cannot reach. The piriformis is the most extreme case of this principle, but it is the principle itself she is teaching.
"Let's make it a lot broader than that. You have the good luck in the rotators that you've got something you can get your hands on, the other end of which will do something for you that your hands can't get to. Now there are several of those rotators. Bill, do you want to go on with that?"
Ida widens the point from one muscle to the rotator group as a whole:
Why the piriformis is the key to the sixth hour
By the sixth hour of the ten-session series, the practitioner has already worked the front of the pelvis, the floor of the pelvis, and the adductors. What remains unreached is the front face of the sacrum — and the rotation of the sacrum within the pelvic basin. In the third hour of her advanced class on March 22, 1975, in Santa Monica, Ida walked her students into this question through Socratic prompts. She refused to let them name the rotators in the abstract; she wanted them to say what the rotators do to the sacrum. The exchange that follows captures her insistence that the piriformis be named not as a muscle but as the determinant of sacral position.
"Well, generally, the rotators, of course, affect the rear back part of the sacrum. Anybody wanna Danny? It seems that a shortening of or a constriction in rotators, especially in my mind, see the piriformis sucking that sacrum over to one side or the other."
Ida draws out from a student the structural reason the piriformis matters to the sacrum:
The student's image of the piriformis 'sucking the sacrum over to one side' is exactly the mechanism Ida built her sixth-hour work around. The fact that there are two piriformes — one left, one right — both attached to the anterior face of the sacrum, means that any difference in their tone immediately becomes a rotation in the pelvis itself. This is not a refined diagnostic point. It is the gross structural fact that drives why the sixth hour exists as a separate hour of the recipe.
"So that if one piriformis is tighter than the other, you're going to have a rotation in the entire pelvis And that's the thing that Doctor. Rolfe was talking about when you start looking at people."
Carolyn, working in Big Sur 1973, states the asymmetry rule plainly:
Carolyn's formulation — analyzing the body 'all along' rather than waiting until the sixth hour to discover what the piriformis is doing — was something Ida insisted on. She wanted practitioners to read the rotational pattern from the first hour onward, even though they would not work the piriformis directly until much later. The earlier hours have to clear the way.
Sacral position and the sixth hour as the hour of the sacrum
Ida's teaching that the sixth hour 'is really the hour of the sacrum' depended on the piriformis being available as a tool. By the end of the fifth hour, the practitioner has used the psoas to organize the lumbars and bring the front of the pelvis up; the back of the pelvis and the position of the sacrum have not yet been addressed in their own right. The whole purpose of the sixth hour, in her teaching from the RolfA3 public tape, is to reach the sacrum — and the only way to reach it is through the rotators, principally the piriformis.
"Up to this point, missed the boat. Oh. Oh, and the sacrum. Sacrum. Yeah. I was with them. The fact that the rotates are attaching on the anterior side of the sacrum. That's right. That's the point of the rotators. Say it again. The other end of the rotators me is the rotates on the anterior surface of the sacrum. You remember that we went into this at great length yesterday, that this is a unique situation where you can get the prevertebral organization of the sacrum from the outside of the body."
Ida names the sixth hour as the hour of the sacrum and the piriformis as the route in:
This passage gives the recipe its architectural logic. The fourth hour horizontalizes the floor of the pelvis through the adductors. The fifth hour uses the psoas to bring the front of the pelvis up off the legs. The sixth hour, finally, reaches around to the back face of the pelvic basin and addresses the sacrum from outside through the piriformis. Each hour does what no earlier hour could have done. The piriformis becomes the muscle that completes the basin.
"And you're looking the key to unlock the block on on this pelvis at this hour is the piriformis. And the reason that's so important is because it goes to the or comes from the anterior part of the sacrum, which is the part we haven't been able to get to and usually the part that the the base is anterior and the apex is posterior too much. And so you work in that area, and the key and the hallmark that the way you've known you've done a pretty good job is that the breathing starts."
Ida describes the path of approach to the piriformis in the sixth hour:
The physiological reach of the piriformis
What Ida claimed for the piriformis was not just a structural effect on the sacrum but a physiological reach into the contents of the pelvis. Because the muscle crosses from inside the bowl out through the greater sciatic notch, working it changes the tone of structures that line the inside of the bony pelvis. In a 1973 Big Sur class, with Bill walking through the anatomy of the obturator fascia and Ida pressing the broader point, she made the case that the rotator work was not a muscle treatment but a treatment of the whole inner pelvis.
"this, there's another important reason for working with piriformis and that is it's coming from the inside of the pelvis to the outside and this is why you give them up a lot of physiological changes in people."
Ida names the physiological consequence of piriformis work:
Ida's point widens in the same passage. The piriformis is not the only structure that crosses from inside to outside — the psoas does too, and the obturator internus reaches into the pelvis via the obturator fascia. When the practitioner works the rotators, she is changing tone on a fascial sheet that lines the inner wall of the pelvic basin. Bill, in this same Big Sur class, named the specific fascial chain: the obturator fascia covers the foramen, thickens around the obturator internus, and provides the attachment for the iliococcygeus muscle of the pelvic floor.
"The obturator internus originates all in here, comes out through this greater eschatic notch that attaches to help rotate the femur. But it's covered on the outside by a thickening of fascia called the operator fascia and that's that operator fascia that the iliopoxygus muscle is attached to. So you can actually affect tone of the pelvic floor by just working on that one particular fascial reflex."
Bill spells out the obturator fascia and its connection to the pelvic floor:
What Ida and Bill together are describing is a continuous fascial sheet that lines the inside of the pelvic bowl and that is mechanically reachable from outside through the rotators. The piriformis sits in this sheet at the back, the obturator internus at the front and side. Affect one and the rest answers. This is why Ida insisted that the rotator work was never just rotator work. It was work on the whole pelvic interior — sacrum, pelvic floor, and the fascia of the inner wall — performed through the one available external handle.
"Well, now, do you remember yesterday how much emphasis I put get into. Sometimes you'd have to come up here and release these gluteals so you could actually go under them and affect the structure and they could allow length for your manipulation underneath that area so that when you got into those rotators, they, again, you're affecting the physiology of the whole area."
Ida names the prerequisite of getting under the gluteals before the rotators can be reached:
Working the rotators without working the rotators
Ida was wary of practitioners who got 'on the rotators and stayed.' Her teaching was that the rotator work, like every piece of work in the ten-session series, depended on what was free above and below it. If the gluteals were short, the hand could not reach in. If the hamstrings were tight, the gluteus maximus would not let the hand under. If the lumbars were locked, no amount of work at the trochanter would produce a sacral effect. The piriformis was the target; the route to it ran through a great deal of other tissue.
"When you get into the rotators, don't want to have tightness above it. But we're working, I don't think this thing really isn't in your life, you're working on all these, you're working on tendons,"
Ida warns against tightness above the rotators when working them:
In her RolfA3 Public Tape, Ida made the same point in the language of the recipe itself. The reason the practitioner spends so much of the sixth hour working up the back of the leg — Achilles, gastrocnemius, hamstring insertions, hamstrings deeper than in any earlier hour — is precisely to make the rotators reachable. The work on the leg is not an end in itself; it is preparation for the moment when the hand goes under the gluteus maximus and finds the insertion of the piriformis on the trochanter.
"Because what is it that allows the rotation of the pelvis around the head of the femur? The rotator. The rotator. The eminent. So this is our working up. The real goal of working up the back of the leg is to get under the Ruleus. That's right. That's right. And this then is going to be the first hour where we have some hope of getting at the anterior aspect of the sacrum by working externally with the insertion of the rotator which arises in it. That's right. And you see all of this once again is a positioning of the pelvis. Obturator will have the inside of the iliac, the ischial aspect of the iliac. But the whole thing then makes a brand new decision."
Ida names the rotator as the reason for the back-of-leg work in the sixth hour:
Ida liked to remind students that the sequence of the recipe was not arbitrary. Every hour built the conditions for the next. By the sixth hour, the bed was soft enough for the rotators to be worked because the first five hours had progressively cleared the obstructions — thoracic restriction off the top of the pelvis, adductor tension off its floor, psoas tension off its front. Only then could the practitioner go in from behind.
The rotators as a fan, not a category
By 1976, in her advanced class in Boulder, Ida had become uneasy with the term 'lateral rotators' itself. She did not abandon the word, but she pressed her students to see the deep rotators as a fan of muscles, each doing something slightly different, rather than as a category whose members were interchangeable. The piriformis remained the structural pivot of the group, but she wanted students to see how the gluteus minimus and the quadratus femoris fit into the same functional fan.
that the turn lateral rotator is something that's gotten us into trouble and I would hope ultimately we can using because I see this as like a often a fan like arrangement of muscles, each of them having a particular function in terms particularly here of the origin of the piriformis on the inside of the sacrum, the origin of the obturator internus on the inside of the pelvis."
Ida revises the language of 'lateral rotator' in her 1976 advanced class:
The revision matters because it changes what the practitioner is doing in the sixth hour. If 'lateral rotation' is the function being addressed, then any of the rotators is interchangeable as an entry point. But if the group is a fan with differentiated jobs — piriformis pulling on the sacrum, obturator internus addressing the inner pelvic wall, gluteus minimus extending the line onto the femur — then the practitioner has to read which of these is doing too much and which is doing too little. The piriformis is then no longer one rotator among five but the one rotator that anchors the sacral end of the fan.
"But I see in terms of function on the femur, the gluteus minimus as just an extension of the rotators. If you say that doesn't rotate it laterally, well it does some but if we get away from that terminology of lateral rotators, it makes it a lot easier because you are usually overusing part of one of these anyway or two of these and not using them all in a balanced way and that includes the minimums. Yeah, I think that the idea of rotation begs the question of what happens when the leg swings forward or back. Because you don't ever make a simple rotation anywhere."
Ida and a student work through why pure rotation almost never occurs in isolation:
This more nuanced view did not displace the basic teaching about the piriformis. It refined it. The piriformis remained the only one of the fan attached to the anterior sacrum and therefore the only one through which the sacrum could be addressed from outside. But by 1976 Ida was teaching her students to read what the whole fan was doing before deciding what the piriformis itself required.
Piriformis size and reach: not the small muscle it looks like
A persistent misconception among Ida's students was that the piriformis was a small, narrow strap of muscle. In her 1976 advanced class she pushed back on this directly. The piriformis fans broadly across the anterior surface of the sacrum, attaching across multiple sacral segments, and travels some distance before reaching its lateral insertion. Treating it as a small muscle, she warned, was treating it as a small piece of leverage — which it was not.
"And the interference with energy patterns in the piriformis which are going to give you problems in the psoas and the I can take it on. It's just such a task to make such a change in weight. And I had the opinion that the piriformis was a broadly short, small muscle. Well, that is where you're making a mistake. That piriformis is extremely important and it isn't that small. And it travels quite a way. And it relates to other muscles that have a very important role in the other four both ways."
Ida corrects a student who imagines the piriformis as a small muscle:
Ida pushed the point one step further. The visible imbalance in the rotators — the tail-end of a body that, in her phrase, hangs out 'waiting in the breeze instead of dropping down' — is not the imbalance of one muscle. It is the imbalance of a system, and the piriformis is its most strategic member because of where its origin sits. The whole system is in trouble when the piriformis is in trouble; the whole system reorganizes when the piriformis is reached.
"In other words, look at the people whose tail end is out waiting in the breeze instead of dropping down the damn hill. Realize how much is involved. You get trouble in the rotators. You've got trouble in a very large system, like your physical system. And it's quite true you talk about the piriformis, but the fact of the matter is that you're calling it, you're calling one member of that system piriformis. The piriformis is so important because it goes from the outside to the inside. How would it be if we had a line up? There's also something else I'd like to call your attention. I can't give you any explanation about it."
Ida widens the lens from one muscle to the system the piriformis participates in:
What the practitioner does and does not find at the sixth hour
In the Boulder advanced classes of 1975, Ida had her senior students walk through the sixth hour as a sequence and tested them on what they would find. The pattern she expected them to name first was not the piriformis itself but the gluteus medius. The medius had to be lengthened before the practitioner could get cleanly to the piriformis underneath. This is the practical layered logic of the hour: the visible aberrant pattern is sometimes the gluteus medius, the structural pattern underneath it is the piriformis.
"No, that should have been gotten into a little earlier, but again, you will get into it again. This is a good thought, but it's not what I was trying to figure out. Steve? I think the piriformis Uh-huh. The location of the of the. Yes. This is right, but that depends on the whole trip. But there is a specific muscle pattern in there that you find almost invariably in the sixth hour. Find the shortening of the gluteus medius. And until you let that gluteus medius lengthen run, you're not going to get what you're looking at."
Ida and her student Steve work through what is invariably found at the sixth hour:
The piriformis returns to the center of the discussion immediately, but now in a layered position. Once the medius has been lengthened, the piriformis becomes the muscle that the practitioner can finally reach — and Ida named again, as she did everywhere else, that the reason it matters is that it crosses from inside the sacrum to outside the body. The teaching is repetitive because the doctrine is unitary: piriformis = anterior sacrum from outside = the only available handle.
"Minimus will take care of itself. Piriformis is really important in this one because it it ties it goes from the inside of the sacrum to the outside. If your medius is too short, you won't get the appropriate freeing with the piriformis as it goes through the is it tattooed from the inside to the outside?"
Ida returns to the piriformis after the medius work, restating its centrality:
On the same Boulder tape, Ida's students Jen and others worked through the further fascial chain — the sacrotuberous and sacrospinous ligaments, the gluteal fascia wrapping the coccyx, the way the coccyx position determines what the floor of the pelvis is able to do. These are the structures Ida wanted the practitioner to consider after the rotator work, because the piriformis alone could not finish the sixth hour. The coccyx had to be addressed; the sacrum had to be allowed to drop; the lumbar fascia had to span.
"Which side is the tightest and what side is the most aberrated to your feet, to your touch. If you want to touch it, but you don't have to, you can see it. And all this tells you about the position of the coccyx. And the position of that coccyx is going to do a very great deal in determining the extent to which you're going to be successful in, quote, horizontalizing your pelvis. It will be very important so that you deal with that coccyx at this point having dealt with the rotators and having found that you're not happy with the rotators and you don't just climb on the rotators and stay, you get off the rotators and go and look at the coccyx and see what effect this has on you. And having done as well as you can in organizing that coccyx, then you go and look at the sacrum."
Ida moves from the rotators to the coccyx and sacrum as the next concern:
The piriformis at the beginning, the piriformis at the end
One of Ida's recurring teaching points was that the practitioner needed to be thinking about the piriformis from the first hour, not only when the sixth hour arrived. The reading of the body in the first hour included the rotational pattern of the pelvis. If the practitioner waited until the sixth hour to discover that the piriformis was the problem, it was too late — the earlier hours had not laid the groundwork. Carolyn made this point explicitly in Big Sur 1973, with Ida endorsing it.
"When a person comes in the first hour, you start thinking about those later hours because when you get there, it's too late if you haven't been analyzing that body all along because you haven't freed it up enough to get down to the deeper structures to get the chains that you want. At any rate, it comes right in here and if they're both tight or hypertonic or hypotonic, then that sacrum is not gonna move like it should. It's gonna be locked in. Tip that whole pelvis up there."
Carolyn names the consequence of not analyzing the body from the first hour:
In the RolfB6 public tape, Ida went further. She named three earlier hours — first, fourth, and sixth — where the practitioner has the opportunity to take a look at the piriformis and its consequences in the pelvis. Each is an opportunity to read the rotational pattern and decide what the body will need. If the practitioner misses these, she said, there is no other logical place coming up where the work can be done.
"And so you work in that area, and the key and the hallmark that the way you've known you've done a pretty good job is that the breathing starts. And when the breathing starts, can see the pumping action of the pelvis when they're laying on their stomach. And oftentimes, have to go up to the in the area of the rhomboids or in the lumbar thorax hinge area because it may be held up there. Hold on a worked on that."
Ida names the recurring opportunities to address the piriformis-related pattern:
The view here is recipe-architectural. The piriformis is not an event of the sixth hour. It is a structural reading that runs across the whole series, with three specific points of intervention. Ida insisted that students hold the whole pattern in mind from the first contact, even though the muscle itself would not be touched until much later.
Piriformis and psoas: paired tools, paired dangers
Ida often paired the piriformis and the psoas in her teaching. Both crossed from inside the pelvis to outside, both could be reached only after extensive preparatory work, and both could become objects of practitioner fixation. In a 1971-72 mystery tape from the IPR series, Ida warned against the kind of single-muscle obsession that, she said, ruined practitioners' ability to see the body as a whole. The warning applied to the piriformis as much as to the psoas.
"He's just written a book on the iliopsoas and which I I have a Listen. Stay away from those books on have them in. Speaking of the iliopsoas muscle, when I was taking my audition class, I think the brains are in the pubococcius muscle and when in doubt say psoas. But Well, I really I really mean what I say. You get to know so damn much about that iliopsoas that you don't know anything about a body."
Ida warns her students against single-muscle obsession:
By August 1974, in her IPR Lectures, Ida had a more synthetic position. The psoas in front of the spine and the rhomboids behind the spine were paired junctions where the upper and lower halves of the body could be brought into balance. The piriformis, in a parallel way, was the back-of-pelvis counterpart to the psoas at the front. The two muscles together formed a kind of cross-strut: the psoas pulling the lumbars forward and down into the pelvis, the piriformis pulling the sacrum into its bowl from behind. Neither could function structurally without the other being available.
"It will also, as I indicated in the brief talk last time, be continuous with that fascia of the quadratus lumborum. It will be continuous below and posterior with the fascia of the piriformis, which is coming from the sacrum. It will be continuous with the fascia of the iliacus, the obturator fascia. And then by the attachment of the combination of the tendon of the iliacus and the psoas, of the iliopsoas tendon be continuous with the fasciata."
An IPR colleague maps the fascial continuity from psoas to piriformis:
Energy, physiological change, and the gateway from inside to outside
The reason Ida kept returning to the inside-to-outside crossing of the piriformis was not merely structural. She believed that working a muscle whose two ends lay in different compartments — one inside the pelvic bowl, one outside on the trochanter — produced effects of a different order from working a muscle entirely outside. The energy interference, as she put it in the 1976 advanced class, was different. So was the physiological response.
"And it relates to other muscles that have a very important role in the other four both ways. See, it's part of the group, But in being a part of the group, it can destroy the whole action of the group. And you see, look at the people in the group, in the class, in the room. Look at the people who are showing you imbalance in the rotators. In other words, look at the people whose tail end is out waiting in the breeze instead of dropping down the damn hill. Realize how much is involved. You get trouble in the rotators."
Ida links the piriformis to energy patterns and to the work it makes possible elsewhere:
This kind of language — energy patterns, the body as a system whose flow can be interfered with at strategic points — was characteristic of Ida's late teaching. The piriformis was, for her, one of those strategic points. Not because it was a large muscle or a famous one, but because its position made it a doorway between inside and outside. The work passed through it. So did the body's response.
"There's also something else I'd like to call your attention. I can't give you any explanation about it. I'd to call to your attention the different way in which these different parts of the human system take on quickness. And you see it as you have this line up here. And I was looking at you and apparently you felt my looking and dropped your arm."
Ida tells the class to look at the line-up of bodies and read the rotator pattern:
Coda: the small muscle with the large reach
Across more than five years of advanced classes — Big Sur 1973, the 1974 IPR Lectures, the Boulder classes of 1975, the 1976 advanced class — the piriformis served Ida as the type-case of one of her central teaching principles: that the body has a small number of strategic structures whose position makes them disproportionately consequential, and that the practitioner's job is to recognize them, prepare the route to them, and use them as leverage on what cannot otherwise be reached. The piriformis was the example she returned to most often, because the geometry of its attachment made the case unambiguous. It was the only rotator whose origin was on the anterior surface of the sacrum, and therefore the only available external handle on a structure that could not otherwise be touched.
"This is a good thought, but it's not what I was trying to figure out. Steve? I think the piriformis Uh-huh. The location of the of the. Yes. This is right, but that depends on the whole trip. But there is a specific muscle pattern in there that you find almost invariably in the sixth hour.
Ida names the piriformis as the invariable finding of the sixth hour:
What remains striking, reading across the transcripts, is how often Ida had to repeat the same single doctrinal sentence — the piriformis is the only rotator that attaches to the anterior surface of the sacrum — to a different room of students, in a different year, in a slightly different context. The repetition is not redundancy. It is the mark of a teacher returning to the structural fact that anchored an entire hour of the recipe, and on which the rest of the pelvic work depended. The piriformis was small, but the leverage it provided ran from the floor of the pelvis to the position of the sacrum and out into the breathing pattern of the whole body. For Ida, that was the whole reason it mattered.
See also: See also: Boulder Advanced 1975, ninth-hour session (T9SB) — additional discussion of how the freeing of the pelvis from below sets up the conditions for the deeper rotator work to hold. T9SB ▸
See also: See also: Boulder Advanced 1975, fifth-hour session (B2T9SA) — practitioner walk-through of the sixth-hour approach including ischial tuberosity, hamstring spreading, and the pelvic lift that follows the rotator work. B2T9SA ▸
See also: See also: RolfB3 public tape (RolfB3Side1) — Ida's discussion of the layered confusion in the third hour around quadratus, psoas, and the deep extensor system, which prepares the conditions for the sixth-hour rotator work. RolfB3Side1 ▸
See also: See also: 1971-72 Mystery Tapes (72MYS141) — on the fascial chain from the adductors through the obturator internus fascia to the psoas, the broader pelvic-floor context in which the piriformis sits. 72MYS141 ▸
See also: See also: Boulder Advanced 1975, eighth-hour session (B2T8SB) — additional discussion of the back work and erector pattern that prepares the sixth-hour rotator approach. B2T8SB ▸
See also: See also: IPR Lecture, August 11, 1974 (74_8_11B) — extended anatomical walk-through of the fascial sheet lining the inner pelvic wall, including the obturator and urogenital diaphragms. 74_8_11B ▸
See also: See also: Big Sur 1973 (SUR7322) — the extended sixth-hour discussion in which Ida and her students walk through the lumbar fascia, sacrum, and coccyx alongside the piriformis work. SUR7322 ▸