Take on the Full Distance Triathlon Switzerland-Thun with confidence and strength. This training plan is expertly designed to mirror the unique demands of the race’s swim, bike, and run courses, helping you cross the finish line stronger than ever. ✅ Swim Ready for Lake Thun’s 3.8 km (2.4 miles) Course Our foundational 12-week phase focuses on essential swim drills, boosting your stroke efficiency and open-water skills. You'll build comfort in the water, essential for the calm, clear, but ...