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Deep Dive on Tim's Low-Back Issues, How to Unlearn Painful Patterns, Movement as Medicine, and More

Shirley A. Sahrmann, PT, PhD, is Professor Emerita of Physical Therapy at Washington University School of Medicine in St. Louis, Missouri.

Tim FerrisshostDr. Shirley Sahrmannguest

Aug 4, 20231h 48mWatch on YouTube

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Show setup: Shirley Sahrmann’s background and why this conversation matters
Tim Ferriss introduces Dr. Shirley Sahrmann and explains why she’s widely respected in physical therapy and movement science. He previews that the conversation will focus heavily on low-back pain and his own ongoing symptoms.
- •Tim frames the show’s aim as deconstructing high performers and introduces Shirley as a major influence in physical therapy
- •Shirley’s academic and professional background is outlined, including her role in movement science and recognition in the field
- •Tim notes the episode will go deep into low-back pain and anatomy because of his recent struggles
Terminology primer: pelvis, hip muscles, spine basics, and positions
Before the interview, Tim defines key anatomical terms and positional language to make the technical discussion easier to follow. He also points listeners to show notes and an anatomy app for visual reference.
- •Definitions include iliac crest, TFL, abduction/adduction, medial/lateral rotation, psoas major, stenosis, and thoracic vs. lumbar spine
- •Tim explains supine vs. prone and ties pronation/supination to hand position
- •Tim suggests learning basic anatomy helps patients communicate better with clinicians and get clearer guidance
- •He recommends an anatomy app to visualize muscles discussed in the episode
Why her first book reshaped thinking: movement as an inducer of pathology
Tim asks why Shirley’s book was so influential for coaches and clinicians. Shirley explains the book’s central aim: organizing diagnostic categories around movement patterns that create or worsen musculoskeletal problems.
- •Shirley describes her long career across different eras of physical therapy and a shift toward movement-based reasoning
- •Her book attempts to define diagnostic categories based on movement impairments rather than only tissue-level labels
- •She highlights shoulder complexity and the need for coordinated scapular and glenohumeral function
- •She notes the internet helped the book reach non-medical-bookstore audiences
From symptom-treatment to cause: how lifestyle and movement entered the conversation
Shirley contrasts earlier PT models—treating symptoms under physician diagnoses—with her emphasis on identifying movement causes. She also describes how the link between lifestyle and health became more recognized over time.
- •Shirley says the profession has not fully adopted the movement-induced pathology framework
- •She describes how PT historically followed physician diagnoses and treated consequences rather than causes
- •She recounts changing views on nutrition and exercise, influenced by work she saw connecting lifestyle to cellular and functional outcomes
- •She emphasizes outcomes aren’t inevitable and lifestyle can improve long-term health trajectories
Low back pain isn’t a diagnosis: naming pain by the movement that provokes it
Tim brings up the idea that “low back pain” is a symptom, not a diagnosis. Shirley explains her approach: identify the movement that consistently triggers symptoms and label the condition by that movement to guide treatment.
- •Shirley clarifies that “low back pain” only describes location and symptom, not cause
- •She proposes naming the problem by the movement that most reliably causes or worsens symptoms
- •She distinguishes her approach from tissue-specific blame (disc vs. facet) because multiple tissues often contribute
- •She frames PT expertise as identifying and changing the aggravating movement pattern
A working hypothesis for Tim: abdominal stiffness, spinal compression, and asymmetry
Shirley offers an initial hypothesis based on Tim being a heavy exerciser: abdominals can become “too much” and increase spinal compression. Tim shares his pain triggers, imaging context, and what seems to relieve symptoms.
- •Shirley says hypertrophied abdominals can become mechanically stiffer and increase compression on the spine
- •She suggests checking ribcage expansion during deep breathing as a proxy for abdominal stiffness
- •She links pelvic asymmetry (one iliac crest higher) to spinal side-bending under compression
- •Tim describes pain being worse with standing/slow walking, sitting on hard surfaces, and relieved by brisk walking and traction
Walking mechanics and “relative stiffness”: TFL/hip flexors, wide stance relief, and first drills
Shirley probes how Tim walks and explains how stiff hip flexors can rotate the pelvis and shift motion into the back. They discuss simple self-tests (feet apart vs. together) and Shirley suggests specific positions and movements to reduce contributing patterns.
- •Shirley suggests checking for pelvic rotation during walking and links stiff hip flexors to lumbopelvic rotation
- •Tim reports tightness/sensitivity in TFL and piriformis and notes relief from iliacus/adductor work and wall sits
- •Shirley explains how abducting the hips (feet wider) can reduce TFL/IT band stretch and level pelvic asymmetry
- •She recommends quadruped rocking without overusing hip flexors and a prone knee-flexed hip lateral-rotation drill to elongate TFL/ITB
Movement System Syndromes (MSS): movement as a “system of systems” and how to unlearn patterns
Shirley explains the movement system concept and why movement deserves its own diagnostic focus. She describes how repatterning requires both targeted exercises and retraining everyday behaviors until the new pattern becomes automatic.
- •Shirley describes the movement system as a “system of systems,” analogous in structure to concepts like the immune system
- •She argues movement can both reflect pathology and induce it (including through too little movement)
- •She emphasizes that nobody teaches most people to walk, and “doing it” doesn’t mean “doing it right”
- •She outlines a two-part strategy: address limiting factors with specific exercises, then retrain daily activities (sitting, rolling in bed, getting up)
Psoas, hip motion, and breathing mechanics: where the back borrows motion
Tim asks about the psoas and why manual work near the pelvis seems to help him. Shirley explains how hip and trunk mechanics—including breathing and ribcage expansion—can shift stress into the lumbar spine, and why hips often drive back symptoms.
- •Shirley explains psoas attachments to lumbar vertebrae and discs and how it can exacerbate back issues; iliacus acts differently because it attaches to the pelvis
- •She describes minimizing iliopsoas use in acute disc irritation and modifying movements to avoid provoking pull on the spine
- •She states that a large portion of back pain cases relate to hips not moving optimally, causing compensations in the spine
- •She explains ribcage expansion and breathing modes (pump-handle and bucket-handle) and suggests strategies to increase ribcage motion without hinging in the lumbar area
Path of least resistance: why symptoms repeat and how the exam finds the culprit movement
Shirley and Tim discuss how the body repeatedly chooses the easiest available motion, even if it’s harmful. Shirley details how she evaluates posture, alignment, and movement tests to confirm which motion pattern reliably triggers pain—and how blocking that motion changes symptoms.
- •Shirley says the body follows physics and moves where it’s easiest; pain often reflects repeated overuse of an easy-but-costly motion
- •Tim describes unpredictable pain flares and the anxiety of not knowing what triggered them
- •Shirley outlines an assessment starting with alignment and simple motions (bend, rotate, side bend), then verifying symptom changes by blocking a motion
- •She describes testing in multiple positions (supine, side-lying, prone, quadruped, sitting) and observing real-life tasks like walking, stairs, and getting in/out of a car
Athletes vs. non-athletes, DNS skepticism, and compression patterns (“collapso-smasho” vs. “squeezo-smasho”)
Tim asks whether assessment changes for athletes and about DNS. Shirley emphasizes that small “early” movement faults matter, questions the need to rebuild adults from developmental sequences, and describes two broad compression-related patterns seen in different populations.
- •Shirley says athletes may dismiss small movement faults, but research suggests symptoms can be triggered by very small early motions
- •She describes a progression idea: correct small isolated issues, then build toward sport-specific complexity
- •She downplays DNS staging for adults and prefers assessing the “finished product” and everyday activity causes
- •She contrasts low-muscle collapse-driven compression (“collapso-smasho”) with over-compression from high abdominal stiffness (“squeezo-smasho”)
Shoulders worn too low: neck/shoulder mechanics, serratus anterior, and all-day follow-through
Tim brings up Shirley’s idea that many people carry their shoulders too low. Shirley explains how shoulder position relates to neck strain and shoulder mechanics, and how strengthening needs to be paired with posture and daily support strategies.
- •Shirley describes an ideal shoulder/clavicle position as slightly elevated rather than sloped downward
- •She links low shoulder girdle position to neck load because supporting muscles attach to cervical vertebrae
- •She highlights serratus anterior as a “sling” supporting the scapula against the ribcage and reducing cervical strain
- •She recommends wall-based arm slides with maintained elevation and stresses that exercises won’t work if shoulders hang down most of the day (armrests, support strategies)
Stretching revisited: “relative stiffness” beats isolated muscle length, and how training can lock you ‘on’
Tim asks about stretching and when it helps or misleads. Shirley argues many problems blamed on “short muscles” are actually imbalances in passive tension between muscle groups, and that some training can condition excessive baseline activation that persists beyond workouts.
- •Shirley distinguishes true shortness from stiffness and emphasizes “relative stiffness” between opposing muscle groups
- •She explains why stretching hip flexors alone may not solve pelvic tilt patterns if abdominal control is the limiting factor
- •She stresses that persistent need for stretching suggests ongoing behaviors are recreating the issue (example of cycling mechanics shortening hip flexors)
- •She describes intensive lifting potentially training widespread co-contraction so muscles don’t “turn off,” leading to stiff movement patterns
Live on-camera assessment: thoracic kyphosis, swayback strategy, and why bridging can backfire
Shirley watches Tim stand and reframes his posture: she sees increased thoracic kyphosis and swayback tendencies rather than simply an exaggerated lumbar curve. She coaches standing control, forward-bend mechanics, and warns that bridging can provoke symptoms by creating pelvic motion the spine doesn’t follow.
- •Shirley observes increased thoracic kyphosis and links rectus abdominis tension to thoracic posture and swayback compensation
- •She tests symptom changes with feet wider and single-leg elevation, pointing again to tensor-driven contributions
- •She cues Tim to return from forward bending by driving hip extension rather than finishing with lumbar overextension
- •She explains why glute-focused bridging can cause painful translation if the pelvis tilts but the spine “doesn’t want to go along for the ride,” advising Tim to avoid bridging if it aggravates him
Aging well with movement: Shirley’s routine, key caution (hip rotation in quadruped), and closing takeaways
Tim asks how Shirley maintains her physical and mental sharpness approaching 86. Shirley shares her lifelong activity and current daily routine, adds a caution about hip medial rotation during quadruped rocking, explains femoral retroversion implications, and closes with a plea for more precise movement diagnoses and individualized exercise guidance.
- •Shirley says she’s nearly 86, notes family dementia history, and attributes resilience to lifelong activity, nutrition changes, and applying movement principles to herself
- •She shares personal stories of posture/alignment changes altering clothing fit, finger flexibility, and shoe-wear patterns
- •She details a daily routine including quadruped work, modified push-ups, prone hip extension/rotation/abduction, supine shoulder and leg drills, wall side-bending, and walking three to four miles
- •She warns that quadruped rocking with hip medial rotation can stress the knee and may contribute to ACL risk; she recommends slight hip external rotation positioning when needed
- •She explains femoral retroversion as a structural variation common in men and argues internal rotation limits shouldn’t be forced; foot position cues should respect structure
- •She discusses Scheuermann’s-related kyphosis as a possibility for Tim and emphasizes preventing worsening rather than chasing “absolute perfect” posture
- •She concludes that movement is complex, internet exercises often ignore variation, and people need clearer movement diagnoses and everyday-activity retraining to reduce disability later in life

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