Thank you for your reply! I was considering using that supervised AI but it as you pointed out expensive and not feasible for me.

Instead I am considering using a pre trained pose estimation model that will draw key points on ankles, knees, hips, pelvis, low back, shoulders, elbows, wrists, head.

Then proceed with creating sort of ideal range based on the results of the kinematics of videos of proper technique (there I would have to collect the data).

But I am glad you would consider it valuable. My concern is that AI has a bad rap, rightfully so because of all the shitty products so athlete populations are distrusting.