I cultivate rock hard fists and kunckles with my Wing Chun kung fu training. Hitting sand bags, a hard wooden dummy man, even oak planks with direct vertical fist power.
All done with bare fist.
You get around more than a tweaked horny teenager.
So was your mom.
Hey hom(e)o I tried wing chunging your mom, but she started laughing so hard that I had to resort to just plain fisting!