I read something at some point about how our fists seemed to have evolved or at least adapted to be well suited to delivering a punch. Many people do not use proper hand forms for it, but I suppose it's a learned skill if not at least through trial and error.
I use it too. Tried a few different ones and like boost the best. I finally just paid for the non-ad tier. One time cost of 3.99. I would have been turned off by a subscription.