I was somewhat sparring the other day and I have no problem clashing shins with people. however, I fought against someone from the same southpaw lead as I was, and he was landing his muay thai roundhouse kicks to the back of my thigh and the back of my calves. I have strong bones so I can handle all the hits from the inside, but not the outside where my muscles are. What muscles need to be built, conditioned, or trained in order to withstand outside leg kicks? I'm thinking maybe squats? Squats works out the quads. Maybe leg press?