Three separate topics here:
Hip Extension:
I had a question, and I'm sure this is common knowledge to everyone but me. What is max range of hip extension one can achieve in the middle split and in life in general? I ask this because while looking at the aid pictures for the middle split (specifically SE23)the camera is at an obtuse angle, and I cannot see how their leg angle is in relation to their hips. I can also see there is a fair amount of forward hip rotation implying a less than 270 degree angle( or 90 degrees backwards), but what is our ideal angle here?
Collapsing Arches:
One thing I noticed while working through the front split is that while doing any Achilles stretches, if I put too much force into the stretch it becomes impossible to keep the foot in a neutral position. My arch collapses and my foot goes flat. If I try to prioritize a well positioned foot then I cannot put any force into the stretch, so I am at a dilemma as to which to prioritize. Proper positioning is important, of course, but how can I strike a balance? or what are other people's approach to this?
Narrow Hurdler:
A far amount of force gets applied to my knee here in this stretch, and not so much into my hip, scaling is of course an option, and I feel that If I lean into my twisted leg trying to get my hip into the ground I can easily illicit some knee pain. This ties into swivel hips too. How can we get enough torque into the hip without causing pain/damage to the knee joint?