From Wikipedia: https://en.m.wikipedia.org/wiki/Manspreading#Physiology “Here's what happens when someone like me sits with my knees close together: The round ball at the top of the femur will pinch against the outside edge of the acetabulum (the hip socket), straining the labrum that lines the socket. To get into that position, I have to activate the adductor muscles on my inner thighs. That automatically triggers resistance from the abductor muscles on my outer thighs, creating tension that ca…
