Exercise invigorates the body and sharpens the mind. Author: Michael Crichton Copy Quote More from Michael Crichton “Increasingly, the mathematics will demand the courage to face its implications.” “Sometimes women scare the hell out of me.” “Malcolm: A karate master does not kill people with his bare hands. He does not …” “You are the reason why he exists on this earth. You don't have the right to aba…”