A complete 26-week Half-Ironman (70.3) training plan authored by coach Mike Llerandi. Covers the full 70.3 distance: 1.9 km swim, 90 km bike, 21.1 km run. Built entirely on heart-rate zones — workouts can be converted to pace or power targets to match your equipment and preferences. Structured in five phases: Base (weeks 1-6), Build 1 (7-10), Build 2 (11-18), Peak (19-23), and Taper/Race (24-26). Includes brick sessions from week 3, an Ironman Descend benchmark in week 6, and a MAF running test that grows from 6.5 km to 10 km over the plan.