A first Half Distance Triathlon does not need to begin with high mileage. This 36-week Beginner plan is designed for athletes who want enough time to build from the ground up before taking on the 1.9 km swim, rolling 90 km bike through the Chevreuse Valley, and three-loop 21.1 km run at Versailles. The opening 12 weeks are about creating a dependable base. Run/jog and bike sessions use RPE and heart rate to teach controlled effort, while strength work and instructional swim drills develop ...