like being skinny has anything to do with fighting
Have you ever been in a fight or are just talking stuff?
Punch a fat/buff dude in the stomach as hard you can - no broken bones, no internal bleeding.
Do this to a skinny dude and he will probably start coughing up blood.
I'm not just talking stuff either, this is true. But some meat on those bones before you go stirring up stuff.
EDIT: I'm pretty sure OP is not a martial arts champion with years worth of black belt status, try again.