When you fall over backwards when trying to do the deep squat - isn't it weak shin/ around ankle muscles, rather than poor ankle flexibility?
If I hold onto something when i'm in a deep squat I can stay there, but when I let go, to stay down I have to pull myself forward, and it's the shin/ ankle muscles that get me forward.
My ankles are pretty flexible I think, although I somehow have the most unmuscular feet/lower legs but am trying to change that. But there's no mention of improving shin/ ankle strength in the videos? Or is there?