alt Hacker NewsIt's an urban legend at the very least that you can improve the power of your punch by grasping a coin roll. I'm not so sure it's good for your hands but unlike a knife or brass knuckles you have some deniability. (Reminds me of the time that the store manager of a supermarket wrongly thought I was shoplifting and he followed me out with his clipboard which I'm sure he planned to whack me with and say it was an accident if I gave him any trouble.)
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A roll of coins, or any other heavy object, will significantly increase your punching power. Short of ninjas or mma fighters, the average person doesnt have the twitch ability to throw a significant punch. By adding mass, you increase power without needing the speed. Hands are very light. Even a small mass increase will make a big difference.
OK, "urban legend at the very least" is a confusing way of putting things, it's kind of like saying "this is false at the very least, possibly even true!" (in this case it's true)