Half Distance Triathlon Boise: From the 1.2-mile swim in the calm waters of Lucky Peak Reservoir, to the 56-mile ride through rural Idaho’s rolling hills, and the 13.1-mile flat run along the shaded Boise River Greenbelt, this course requires stamina, pacing, and resilience. Average race-day temperatures—72°F for the swim and 81°F on the run—reinforce the need for heat adaptation and smart hydration strategies. Our 36-week Half Distance Triathlon Training Plan for Masters Athletes 40+ is ...