Half Distance Triathlon Des Moines, Iowa – Advanced 36-Week Training Plan Train with Purpose. Race with Power. Succeed in Des Moines. The Half Distance Triathlon Des Moines combines urban excitement with rural charm. From a fast, downstream swim to a rolling countryside bike course and a spirited run through scenic Forest Park, this event rewards disciplined, focused training. Our 36-week Half Distance Triathlon training plan is built to give serious athletes like you a competitive edge on ...