Most traditional martial artist use sand, rice or a makawari board to strenthen their hands. Also doing pushups on your knuckles works good. Also squeezing a rubber ball or spring hand gripper. Don't go looking for a street fight to test your hands--join a martial arts club and do something productive like spar in gloves. Stay out of trouble and keep searching.
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The Way of the Warrior is Practice. Daily practice, accumulate practice minute by minute, hour by hour and day by day. {Book of 5 Rings} Mike Brewers 2008 Sit up challenge 50,000/100,000 running balance.(Crunches) Kicks 6,300/100,000
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