Just dont beat them so much that you get arthritis later in life.
Best to start off with sand and get courser and courser stuff till your into small gravel to toughen the skin up like leather first.Then go onto lead pellet filled sacks for tempering knuckles for punching.
There are herbs you can buy through the chinese that stop any bone damage but your skin goes like iron when tensed up.
You have to heat it up like a tea and soak in it for 20 miniutes after training on the hard bags.
Whats going on you going to fight Kimo slice ?
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