I think I have never ever seen someone form a fist with their thumb *in* their fist.. isn't it kind of awkward to position it like that?
Good advice, tho, if someone needs that advice they shouldn't be fighting in the first place
@Athengrim There are many people who punch like that since making a fist for some is awkward , and some who's thumb sticks out a little when they punch. It actually takes a long time usually for a hand to get used to being in a fist