500lb heavy bag what? boxing what?
Muay thai.
Guy in the top video has quite bad form, I'm guessing this is cuz the tire is hurting him too much, the guy kicking the concrete is a mistake, this i show people break their shins, the guy kicking the tre - he's kicking a banana tree, quite common practice in thailand since banana trees are supple and kinda rubbery, guy opening the coconut... kinda sucks that it took him that long lol