RECONsider... Infrasternal Angle Confusion — Solved with Bill Hartman
Reconsider... with Bill Hartman
How to Measure ISA as a Behavior
Bill describes using hand contacts to sense ribcage external/internal rotation rather than treating ISA as a fixed number.
The ISA isn’t the answer. It’s the question.
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💡 Most people measuring ISAs are looking for a fixed answer. But in the UHPC Model, the infrasternal angle (ISA) isn’t a number — it’s a behavior. And if you’re basing your entire intervention strategy off “wide vs narrow,” you’re likely missing the point.
In this episode of the UHPC Podcast, we break down what the ISA really tells you (and what it doesn’t).
You’ll learn:
🔸 Why the ISA is a proxy measure.
🔸 The most common errors people make when assessing rib cage shape.
🔸 How compression, compensatory strategy, and behavior blur structural bias.
🔸 When your “narrow” isn’t really narrow — and how to know.
🔸 Why trusting the process matters more than getting the angle right.
🧠 The ISA doesn’t predict outcomes. The response to intervention does. Learn how to measure, sense, and course-correct inside the only coherent movement model that connects structure, behavior, and constraint.
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⏱️ Chapters
0:00 — Why the ISA conversation keeps coming back
How the YouTube algorithm loves ISA content — but it often draws people in through the wrong lens.
1:50 — What the ISA actually is
It’s a proxy for rib cage behavior during breathing — and it requires context, structure, and experience to interpret properly.
4:36 — Experience matters more than accuracy
The difference between making a wrong call and letting the response reveal your answer.
10:52 — What not to do when measuring ISA
Bill explains why using a goniometer or basing your entire intervention off of ISA alone will lead you down the wrong path.
13:44 — Archetypes, compensation, and behavior
How structure becomes more apparent after compensation is resolved and why this trips people up.
19:36 — Why behavior reveals more than structure
ISA “types” can look the same under compression.
22:36 — Measurement is a beginning, not a conclusion
This wraps with how to let the system show you where to go — even if your initial measurement was off — by using process, and KPIs.
📅 New episodes every other Tuesday @ 12 PM ET
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