Most people think exercise is healthy-and for the most part, they're right. However, it is possible to have too much of a good thing.John Badessa is perhaps one of the most motivated people on the planet. In his memoir, Fit2BeSick: The Side Effects of Perfection, he chronicles his run as a world-champion BMX racer and his complicated relationship with fitness.After conquering BMX, he got into auto racing, weight lifting, and road cycling. There were many bumps in the road, but Badessa stayed the course, constantly striving for perfection. However, he would come to learn that as one draws near perfection, it only retreats further into the distance.In addition to chronicling Badessa's journey to the top echelons of BMX and road cycling, Fit2BeSick serves as a warning to athletes who push themselves too far. Badessa learned too late that overtraining can be counterproductive, he thought he was pushing himself to the edge, but instead he hit a wall. His story is an important one for anyone who has his or her sights set on the highest level of physical achievement. Sometimes you've got to hold something back before you can go all the way.