There's an evil misconception that circulates the endurance community. This false idea is the very common idea that strength training in heavy rep ranges and without any type of bosu ball will make endurance athlete's big and slow. Whether its runners, triathletes, rowers, or just about any other endurance athlete, it seems to be the prevailing notion that high repetition weight training and circuits are the only acceptable protocols to improve endurance performance through strength training.  And this is false.