Strength training does more than just prevent injury. Even in a multi-hour endurance event, explosive power is key for performance, and lifting is one of the best ways to improve.
http://triathlon.competitor.com/2013/08/training/the-new-rules-of-weight-training-for-triathletes_82281
http://triathlon.competitor.com/2013/08/training/the-new-rules-of-weight-training-for-triathletes_82281
