I see alot of random stuff on Japanese TV. Today's was the claim that biting on a tissue increases your strength. Take a tissue, fold it in half, then once again, then again, then the last 2 times fold in half the short way so you end up with a tissue pad about 4 inches wide by 1/2 an inch thick. Now put it between your teeth and as you do something strenuous, bite down on the tissue, just like most people clench their teeth when straining say to pick something up.