There are burlap bags with grandualr beans or metal filings that you can punch to toughen knuckles as well. We use those first, then a makiwara. Heavy Bags usually lead young students to rip all of the skin off their knuckles and bleed all over the bag.
Also you can practice hitting pine boards without breaking force. That conditions your knuckles but has enough give to not do too much damage to untrained knuckles while working focus.
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I know Nietzsche doesnt rhyme with peachy, but you sound like a pretentious prick when you correct me.
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