Every one had good advice and I think a couple hit it right one the nail. Don't try and knock the bag out when u hittin'. Yea ur hands will toughin' up after a while and they get used to the punishment. It is also like they said too, it is the way u hit,how hard ur hitting,how well your hands are wraped,and how used to the punishment ur hands are. U can also drink loads of milk and shit that has calcium in it to streanthin' the bones.