Competitive athletes know how to work hard. What separates an ambitious Half Distance Triathlon build from a collection of tough workouts is timing: establishing endurance before adding intensity, then turning fitness into disciplined race execution. This 36-week plan gives Sprint and Olympic-distance racers that sequence—even when consistent endurance training has been missing for up to 90 days. Your first 12 weeks restore the foundation: aerobic conditioning, functional strength, and swim ...