PERFORMANCE-FOCUSED MARATHON TRAINING DESIGNED TO HELP EXPERIENCED RUNNERS GET FASTER. This 20-week Advanced Marathon Training Plan is built for runners looking to improve marathon performance through higher training volume, structured workouts, marathon-specific long runs, and consistent aerobic development. Designed for runners already comfortable running 5–6 days per week with previous half marathon or marathon experience, this plan blends structured workouts, long-run progression, fueling ...