This 36-week Long Distance Triathlon program is purpose-built for competitive Masters athletes (ages 40+) racing the Jacksonville, Florida course — a fast, scenic, and river-driven event that rewards precision pacing and endurance efficiency. Grounded in proven physiological principles and performance analytics, this plan develops the aerobic power, muscular resilience, and pacing intelligence required to thrive across the St. Johns River swim, the flat 112-mile city-center bike, and the ...