i've done boxing in my teens and I did one class of teakwondo, now I do muay thai and have been for 2 months. Its very hardcore and very badass, but again Im not trying to argue with you here but lets not discredit Bruce Lee, his closet students documented that he hardly threw those kicks in real fights because he knows they are in effect in a real fight. Bruce Lee adopted boxing techniques and dropped some of his traditional kung fu training to adapt to the strategies of styles such as boxing, muay thai, jui jitsu. This is why he formed Jeet Kune Do.