Is This Plan For You?
This 20-week Half Marathon Base plan by GA Endurance is designed for runners who want to build a strong and structured aerobic foundation before moving into race-specific training.
It is ideal for intermediate athletes who can comfortably run 8–12 km and are ready to improve endurance, pacing precision, and durability through a consistent, data-driven system.
This plan focuses on long-term development—establishing the aerobic capacity and steady-state strength required for sustainable half marathon performance.
What You Can Expect
• A complete 20-week Base progression designed for intermediate runners
• Gradual and controlled increase in volume with precise intensity management
• Strong emphasis on aerobic capacity, steady-state strength, and fatigue resistance
• Structured long runs and steady sessions to improve pacing stability
• Integrated testing phases to track progress and recalibrate training zones
• Clear, easy-to-follow workouts using pace, heart rate, or perceived effort
• Optional strength guidance to support durability and injury prevention
Coaching & Support
This plan includes Coach Access.
If you have any questions during your training, you can reach out anytime via:
coachsupport@gaendurance.com
Requirements
To start this plan, you should be able to:
• Run continuously for at least 8–12 km
• Train consistently 4–5 times per week
• Have prior structured training experience
• Commit to a progressive 20-week base development phase
A GPS watch or heart rate monitor is strongly recommended for best results.
Final Note
This 20-week Base plan is designed to build your performance from the ground up.
Over time, you will develop a stronger aerobic engine, improved pacing control, and the durability required to handle more advanced and race-specific training.
For best results, continue your progression with the next phase of training at:
Explore more training plans at GA Endurance
Goksen Cinar, MSc, is a sports scientist, national team coach, and founder of GA Endurance. With more than 25 years of coaching experience, he combines sports science, endurance coaching, and data-driven methodology to help athletes achieve sustainable performance improvements. He is a 4-time Ironman 70.3 World Championship qualifier and 4-time full-distance Ironman finisher.