Within reason anyone can be taught to punch hard, It can be taught thats the truth. most fighters who can punch are taught the same but there concept is different from the non puncher psyhcologily theres a difference and a wider understanding of the part of gravity has to do with the generation of power delivered by the body. Tex books they dont read its not in there its a personal thing ask them and theyde be stumped to explain and wouldnt tell you anyway