Before I start, let me say that I trained in Kyokushin Karate and have no MT experience. I in no way intend to start a flame war. As I understand it, in a Muay Thai roundhouse kick, the knee is kept extended (as if swinging a baseball bat?). However, in KK, students are taught to kick with the knee initially bent, and to extend the knee just before impact (the knee won't be fully extended by the time the kick lands). The kicker still pivets the foot and turns the hips over. I'm just curious why in MT, the roundhouse kick does not take advantage of the quads (knee extensors) as they are one of the strongest muscle groups in the body. According to Kinetic linking theory, it would make sense to keep the knee bent and extend just before impact. Maybe I misunderstood. Could the MT buffs explain to me why this is not included? Once again, I don't mean to criticize, I just want to understand.