Alwyn Cosgrove discusses the difference between mobility and stability, and how to spot them. Notably, he looks at two pics of an overhead squat, one where the dude has decent form, and another where the dude doesn’t. It LOOKS like a mobility problem, but when they get into the same position while lying on the ground, they can both mimic the overhead squat form.
So the difference in squat form and depth was not a mobility issue – it was a stability
issue. Essentially the body is shutting down the range of motion – not
because of tightness or a restriction – but because it perceives a
threat due to the lack of stability.…
Conclusion – a range of motion deficit or asymmetry may not be related
to tissue length or tension at all. It could be related to core
stability.
