12-Week Base Phase Training Plan for the Lifestyle Triathlete Build Strength, Endurance & Confidence – Your Road to Triathlon Success Starts Here! Are you ready to lay the foundation for a strong and sustainable triathlon journey? This 12-week base phase training plan is designed with the 3/1 approach (three weeks of progressive load followed by one week of recovery) to optimize your endurance, strength, and performance. What to Expect: ✅ Structured Training Progression – Start with just 4 ...