Punching

Punching barehanded is something that hurts a lot and is very risky. If your arm and wrist and hand isn't properly aligned, you'll break a bone. Even just punching a punching bag is dangerous.

When it comes to punching, try to always punch with you pointer finger and middle finger knuckles. This will drastically lower the risk of breaking a finger. (If you punch with your outer 3 knuckles and you miss slightly, you'll probably break your pinky)

Basically don't try to punch any hard parts of human bodies unless you're mentally prepared for the pain. Go for the soft spots such as the stomach and balls.