with two or three days of light exercise or even complete rest, and it's a major problem for triathletes. Scott Molina, winner of over 100 professional triathlons and the Ironman World Champion in 1988, has long believed that some triathletes overtrain. "I

, too often, you will wind up sick, injured or overtrained. Too little intensity and you will not achieve your potential in races. If you get the intensity wrong it doesn't matter if you are doing everything else right - you will not reach your full

flaring, back off. "The single most common cause of re-injury is doing too much too soon," Pruitt says. Your body may also be vulnerable to over-training when you're coming back from injury, so respect rest and easy days.

Triathlon is holistic. No other sport works so many muscle groups in so many ingeniously torturous ways. So it makes sense to think about the body from top to toe, inside and out. Bones, muscles, tendons and nerves work together and any problem can