Each year, thousands of people in Colorado are injured snowboarding or skiing. But according to physiology Professor Robert Mazzeo of the University of Colorado at Boulder, the best way to avoid an injury is to get into shape before you slap on the boards. "Fatigue is one of the primary causes for falls, which is the major cause of injuries in skiing," said Mazzeo. "The best way to battle fatigue is to get into shape before you ski." Mazzeo suggests the following exercises for getting into shape: