If you're 40 or older and ready to take on one of the most breathtaking challenges in endurance sport—the Full Distance Triathlon Japan—this is the plan built for you. Swim 3.8km through the historic Tsugaru Kaikyo straits, ride 180km down the traffic-free Hakodate-Esashi Expressway, and run a fast, flat 42.2km with Mount Hakodate in the distance. You’re not new to triathlon. You've maintained your fitness base—and you know that smart training, not just hard training, wins races. That’s why ...