Want an Hawaiian punch

Title From the 60's commercial 

 A punch is more than you think  When done right your hand is your weapon and you don't loose it when you use it   An interesting look at the physics and physiology of making a fist that won't break under pressure

source  Popular Science  David Nield  https://getpocket.com/explore/item/how-to-throw-a-punch?utm_source=pocket-newtab