Dr. Joe Vigil discusses an athlete's biological adaptations to meet maximum performance capabilities. This is an exclusive excerpt from the soon to be released "USA Triathlon Art & Science of Triathlon Video Series #3." With nearly 18 hours of the most cutting-edge and time-tested triathlon knowledge from some of the world's leading authorities, this brand new third series features an array of comprehensive presentations touching on every facet of triathlon coaching and training. Whether you coach elites, age-groupers or paratriathletes, or if you are an athlete yourself, this powerful video series is an indispensable resource through which you can discover the peak of performance potential. For details and purchasing information, visit the Endurance Films Online Store.