How to increase the intensity of punches.
Take a broomstick, hold the middle, then start twisting it while extending your arms straight out. This will build your forearms and the part where your tendons and biceps connects.
Take a towel. Starting playing tug of war with your buddy with 1 hand. The way you hold it depends on which muscle you want to work. If your partner is weaker than you, eventually he'll catch up. Find someone around your strength. If you don't have a partner, get a long towel and tie it to something stiff.
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