Is This Program Right for You?
GA Endurance’s 40-week 100K / 50 Mile Ultra Intermediate program is designed for runners who want enough time to develop ultra-specific endurance, trail skills, and race readiness progressively.
The program balances load and recovery, using long trail runs, climbing and descending skills, fueling practice, and controlled race-specific work to prepare you for a 100K / 50 mile goal.
What You Can Expect
• Easy, long, and back-to-back trail runs
• Climbing, descending, and run-walk strategy sessions
• Strength and mobility work that supports durability
• Fueling, hydration, and equipment practice
• Planned lighter weeks that balance training load and recovery
• Race-specific endurance work and a structured taper
• HR and TSS-based training for clear workload tracking
Coaching and Support
Every workout includes the session purpose, intensity guidance, and practical execution details. For support with program setup, training zones, or TrainingPeaks, contact the GA Endurance team at coachsupport@gaendurance.com.
Starting Requirements
• Be able to run continuously for approximately 2.5–3 hours at an easy intensity
• Exercise regularly at least 4 days per week, including 3–4 running days
• Have a consistent long-run background and control effort on rolling or varied terrain
• Be able to practise fueling and hydration during long sessions and recover between back-to-back days
• Be ready to increase ultra-specific volume gradually while maintaining consistent recovery habits
A GPS watch and heart-rate monitor are recommended.
Final Note
This program develops 100K / 50 mile readiness through consistent execution, disciplined intensity control, reliable fueling, and careful recovery. These habits form the foundation of confidence on race day.
Explore GA Endurance’s other training programs
I’m Goksen Cinar, MSc, a sports scientist, national team coach, and founder of GA Endurance. With 25+ years of experience and more than 2,000 athletes coached, I combine sports science, data analysis, and practical endurance coaching. I’m a 4-time IRONMAN 70.3 World Championship qualifier and 4-time full-distance IRONMAN finisher, providing full-time coaching built around each athlete’s goals and life.My coaching philosophy begins with the individual.