Half Distance Triathlon Boise: Prepare with Purpose, Perform with Confidence This event offers a 1.2-mile wetsuit-legal swim, a rolling 56-mile bike through scenic countryside, and a flat 13.1-mile run along the shaded Boise River Greenbelt. With summer race temperatures averaging 81°F (27°C), the course presents a unique blend of speed, heat management, and endurance demands. The 36-week Half Distance Triathlon Training Plan for Senior Triathletes 60+ is purpose-built to prepare you for this ...