Endurance sports have become an increasingly popular part of modern day exercise and training programs. Currently, triathlon is one of the most rapidly growing recreational sports in the nation. Unfortunately, it is also responsible for a significant number of common overuse injuries in and around the knee and lower leg. Running is plagued by a higher proportion of knee injuries than cycling because of the "high impact" nature of the sport. Endurance athletes running more than 25 miles per week have an annual injury rate of 30%. Approximately 50% of these injuries occur in the knee!