chinto
Senior Master
You can also use the bottom three knuckle for pushups. Use whatever your martial art uses for the punch. I use the first two, but in JKD and other martial arts they punch with the bottom three knuckles.
hmm really? interesting as the metacarpals for the bottom three knuckles are smaller and less able to take the impact then the first two. with training you can build the bone density but still .. ( ex EMT here and so the anatomy choice is interesting in that it seems less then optimal.)