Squat University's answer to knee pain is "test, don't guess." Here's how a coach uses that framework without playing therapist.
Knee complaints are the most common thing a general roster throws at you, and the temptation is to reach for a generic "top 5 knee fixes" list. Aaron Horschig's screen-correct-retest approach is a far better model - but he's a physical therapist, and you're not. This breakdown covers his method in our own words, draws the hard line between coaching education and medical treatment, and shows how to run a repeatable screen once and reuse it across clients.
By Markus Evers · September 2026 · a Coachway video breakdown
the short version
Squat University's video argues that knee pain in the squat is a symptom to be screened, not a diagnosis to guess at - so you test the individual's mobility and stability, match corrective work to their specific weak links, program it frequently, and retest before deciding to progress or drop it. The one thing a coach should take from it: adopt the screen-correct-retest loop for cleared clients, and refer anyone with acute, unexplained, or non-improving knee pain to a clinician. Coaches screen and educate; they don't diagnose or treat.
Squat University - Squatting With Knee Pain? (EVALUATION & FIX)
Source: Squat University on YouTube - "Squatting With Knee Pain? (EVALUATION & FIX)". Watch on YouTube. We embed the public video and summarise it in our own words; the video, title and channel belong to Aaron Horschig / Squat University, and nothing here implies his endorsement of Coachway. This page is general coaching education, not medical advice.
Who is Squat University, and why coaches watch
Squat University is the channel of Dr. Aaron Horschig, a physical therapist and strength coach who built his following by owning one narrow, searchable problem: pain-free squatting and lifting. He translates clinical assessment into repeatable, demonstrable videos, and he is the author of The Squat Bible and Rebuilding Milo. For coaches he has become a default reference for what to do when a lift hurts - if a client has ever sent you a clip and asked "why does my knee do this," there is a good chance the answer they half-remember came from him. That is the lens this page is written for: not "should I copy his rehab protocols," but "what can a coach responsibly take from his framework - and where does my scope end and a clinician's begin." Because Horschig is a licensed clinician and you may not be, that boundary is the whole point of this page.
What Squat University actually argues (our summary)
This is our summary of the ideas in the video, in our own words - not a transcript. Watch the original for his exact tests, demos and progressions.
- 1
Knee pain is a symptom, not a diagnosis. The whole approach starts by refusing to guess a single "cause." Pain in the squat can come from mobility, stability, load, technique or something clinical - so you evaluate before you prescribe.
- 2
Test, don't guess. He screens the individual - which movements provoke the symptom, and which specific mobility and stability links are limited - instead of handing everyone the same generic "top 5 knee exercises."
- 3
Match the correction to the weak link. The drills follow the screen. If the limitation is ankle or hip, the corrective addresses that; the knee is where the pain shows up, not always where the problem lives.
- 4
Frequency over intensity, then retest. Correctives are done often - most days - because they groove mobility and control rather than add hard training load, and he retests the same screen periodically to check whether the work is actually earning its place.
- 5
Taper the drills into warm-ups. As pain settles and mobility evens out side to side, the dedicated corrective work is dialled back and folded into the warm-up - the goal is to graduate out of "fixing" mode, not to do stretches forever.
Coachway's take
We love the framework, and it's the reframe most general coaches need: stop reaching for a generic knee-exercise list and start with a screen. "Test, don't guess" turns a vague complaint into a defensible loop - screen, match a correction to what the screen shows, retest a few weeks later. That's the same test-retest discipline you'd apply to any program, just pointed at movement quality instead of a working weight.
But here is the line we won't blur, and it matters more on this topic than on any other breakdown we've written: Aaron Horschig is a physical therapist. You, most likely, are not. A coach can screen movement, coach technique, and assign general mobility and stability work as education for a client who is healthy or already cleared. A coach cannot diagnose an injury, cannot treat one, and should not try. The moment a client has acute pain, swelling, pain at rest, a recent injury or surgery, or symptoms that aren't improving, the correct move is to refer them to a physio or physician - full stop. Screen and refer; don't diagnose and treat.
The practical version for a coaching business: build a simple, non-clinical movement screen into your intake, use it to catch the clients you should route out before you ever program a squat, and for everyone who's cleared, assign a short, frequent mobility block and check how it feels at the next check-in. That protects the client, and it protects you - "I coached technique and general mobility, and referred out anything that looked medical" is a defensible position; "I tried to fix an undiagnosed knee online" is not.
So our version of his advice is: adopt the screen-correct-retest loop, keep it firmly inside coaching scope, and refer generously. Then - and this is the part that saves your evenings - build the screen and the corrective block once as reusable pieces and apply them across the roster, instead of improvising a new "knee fix" for every client who mentions a twinge.
Build the screen once, run it across the roster
A screen-correct-retest loop is only useful if you can run it without rebuilding it for every client. In Coachway you put the movement screen and the "any red flags - refer out" question into your intake with forms, so every new client is screened before you program a squat. The matched corrective work becomes a reusable phase in the workout builder - drag the drills in with a demo video on each, set per-client ranges, and assign it in seconds instead of writing a fresh block each time. Then you track the retest and client-reported pain over the weeks through client progress and check-ins, so you can see whether it's actually working - or whether it's time to refer out.
For the neighbouring pieces: our breakdown of Ben Patrick on building knee resilience covers the prehab side of the same joint, our guide to running remote form checks is how you'd assess a client's squat at a distance, and what corrective exercise is (and isn't) stakes out the same scope boundary this page draws.
Knee Screen & Correction protocol (screen → correct → retest)
A client-facing loop you can copy for any cleared client who reports knee discomfort in the squat. It follows the screen-correct-retest logic: check what provokes the symptom and where mobility is limited, assign matched drills done most days, then retest and decide to progress, maintain as a warm-up, or refer out. The frequency and timeline below are our conservative coaching defaults, not figures from the video - and the guardrail at the top is not optional. This is general coaching education, not medical advice.
Knee screen & correction
Refer out first if any of these are true: acute pain, swelling or instability; pain at rest or at night; a recent injury or surgery; pain that is sharp, severe, or getting worse; or symptoms that don't improve. A coach screens and refers - a coach does not diagnose or treat.
Step 1 · Assess (screen, don't guess)
| Check | What you're looking at | Your notes |
|---|---|---|
| Symptom-provoking movement | Which part of the squat hurts, and at what depth/load | — |
| Ankle mobility | Dorsiflexion range, left vs right | — |
| Hip mobility | Squat depth / hip flexion, side to side | — |
| Stability / control | Knee tracking under load, single-leg control | — |
| Red flags | Any refer-out criteria above? If yes → stop, refer | — |
Step 2 · Correct → Step 3 · Retest
| Stage | Action | Frequency (default) | Decision |
|---|---|---|---|
| Correct | Assign drills matched to the limited link (not a generic list) | Most days (~4-6x/week) | — |
| Check in | Client logs pain (0-10) and how the squat feels | Weekly | — |
| Retest | Re-run the same screen from Step 1 | Every 3-4 weeks | — |
| Progress / taper | Improving → fold drills into warm-up. Not improving → refer out | At each retest | — |
How to use it: run the screen at intake, match the corrective to whichever link the screen flags, keep it frequent and light, and let the retest - not a hunch - decide whether to progress, taper the drills into the warm-up, or refer out. Only for cleared, generally healthy clients; anyone with the red flags above goes to a physio or physician first.
KNEE SCREEN & CORRECTION PROTOCOL (via Coachway) - screen -> correct -> retest. General coaching education, NOT medical advice. REFER OUT FIRST IF ANY ARE TRUE: acute pain, swelling or instability; pain at rest or at night; recent injury or surgery; sharp/severe/worsening pain; symptoms not improving. A coach screens and refers - a coach does not diagnose or treat. STEP 1 - ASSESS (screen, don't guess) Check What you're looking at Your notes Symptom-provoking movement Which part of the squat hurts, and at what depth/load Ankle mobility Dorsiflexion range, left vs right Hip mobility Squat depth / hip flexion, side to side Stability / control Knee tracking under load, single-leg control Red flags Any refer-out criteria above? If yes -> stop, refer STEP 2 CORRECT -> STEP 3 RETEST (frequency/timeline = our coaching defaults, not from the video) Stage Action Frequency Decision Correct Assign drills matched to the limited link (not a generic list) Most days (~4-6x/week) Check in Client logs pain (0-10) and how the squat feels Weekly Retest Re-run the same screen from Step 1 Every 3-4 weeks Progress/taper Improving -> fold drills into warm-up. Not improving -> refer out At each retest HOW TO USE: Run the screen at intake, match the corrective to the flagged link, keep it frequent and light, and let the retest decide: progress, taper into warm-up, or refer out. Cleared, generally healthy clients only.
Squatting with knee pain - FAQ for coaches
Why does a knee hurt when squatting?
There are many possible reasons, and that is exactly the point Squat University keeps making: knee pain in the squat is a symptom, not a diagnosis. It can trace back to a mobility limitation somewhere else in the chain, a stability or control issue, load and volume that outran recovery, technique, or something that needs a clinician's eyes. For a coach the honest answer to a client is never a guess at the cause - it is a movement screen plus, when anything is acute, painful at rest, or not improving, a referral to a physio or physician. Coaches educate and screen; they don't diagnose.
What is Squat University's 'test, don't guess' approach?
Aaron Horschig's documented method is to screen the individual before prescribing anything: look at which movements provoke the symptom, test the specific mobility and stability links that feed the squat, and then match corrective drills to that person's actual weak points rather than handing out a generic 'top 5 knee exercises' list. He programs the correctives frequently, retests the same screen after a few weeks, and tapers the drills from dedicated work toward warm-ups as symptoms settle and mobility evens out side to side. For a coach it is a clean, repeatable framework - screen, correct, retest - as long as you keep it inside coaching scope.
Can an online coach fix a client’s knee pain?
No - and framing it that way is the risk. A coach is not a medical provider, cannot diagnose an injury, and should not try to treat one. What a coach can do, for a client who has been cleared or has only general stiffness and no red flags, is run a movement screen, coach better squat technique, and assign general mobility and stability work as education, then track how it feels over time. The moment there is acute pain, swelling, a pain that persists at rest, a recent injury or surgery, or symptoms that aren't improving, the coach's job is to refer out, not to keep 'fixing.' Squat University's own content is made by a physical therapist; borrow the framework, not the clinical role.
How often should corrective drills be programmed?
Horschig's documented approach leans on frequency over intensity: the corrective work is done most days of the week rather than saved for one heavy session, because it is about grooving mobility and control, not adding a hard training stimulus. He then periodically retests the same screen to see whether the drill is actually earning its place before progressing or dropping it. For a coach, the practical version is to assign a short daily-ish mobility block for cleared clients, review it at the next check-in, and keep only what the retest shows is working - the same test-retest discipline you'd apply to any part of a program.
More training-science breakdowns
- · Ben Patrick on building knee resilience - the prehab side of the same joint, for cleared clients.
- · How to run remote form checks - how you'd actually assess a client's squat from a distance.
- · The full roundup: fitness YouTubers coaches should study.
Keep dialing in joint-friendly coaching
all guidesBen Patrick on Bulletproofing Your Knees: The Knees Over Toes Method (Coach Breakdown)
Ben Patrick's knee-resilience argument, broken down for coaches: why progressively loading the knee through full range beats avoiding it, and how to program a joint-friendly prehab block for clients.
Read the guideWhat Is Corrective Exercise? A Coach's Guide (2026)
Corrective exercise is movement-quality coaching for healthy clients, not treatment. What it honestly looks like in practice, the fair critique of the corrective industry, and the refer-out line every coach holds.
Read the guideExercise Progression and Regression for Coaches (2026)
Progression is the smallest change that keeps a client adapting; regression is the respectful step back that keeps them training. The nine progression variables, pattern ladders for six movements, and the decision rules for when to move.
Read the guideFree tools for this: Squat Calculator · Warm-Up Set Calculator · Deadlift Calculator
Build the screen once, reuse it across every client
A screen-correct-retest loop only pays off if you can run it without rebuilding it per client. Coachway lets you put your movement screen and refer-out question in the intake, template the matched corrective block in the workout builder, and track the retest and client-reported pain through check-ins - so you can see it's working, or catch when it's time to refer out. Start your 14-day free trial and screen your first client roster from one screen.
