How would you find a rough estimate of what his muscle strength needs to be? Something like calculating the force at which he would hit the ground, which would be approximately the same weight he would need to be able to squat? I know I'm not thinking of the units correctly. I really don't know physics. I just wanna know what kind of strength it would take to land from free fall like the superheroes do in the movies. Would they have to be able to squat 2k pounds, 20k pounds, or what?