Is This Plan For You?
This 20-week Half Marathon Intermediate plan by GA Endurance is designed for runners who want a focused, structured progression that leads all the way to race day.
It is ideal for athletes who can comfortably run 8–12 km and are ready to improve endurance, pacing control, and race execution through a consistent and performance-oriented system.
If you are looking for an efficient and well-structured pathway that balances aerobic development with race-specific preparation, this plan provides a clear and effective approach.
What You Can Expect
• A complete 20-week progression from Base → Build → Race Preparation
• Gradual increase in volume with structured intensity management
• Dedicated phases for aerobic development, steady-state strength, and race-specific work
• Long runs and steady sessions to improve pacing stability and endurance durability
• Race-pace sessions to build control and confidence before race day
• Integrated testing phases to track progress and recalibrate training zones
• A structured taper phase to ensure optimal freshness for race day
• Clear, easy-to-follow workouts using pace, heart rate, or perceived effort
• Optional strength guidance to support injury prevention and consistency
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
• Be preparing for a half-marathon within the next 4–5 months
A GPS watch or heart rate monitor is strongly recommended for best results.
Final Note
This 20-week plan is designed to efficiently prepare you for race day through a clear, structured progression.
You will build your aerobic capacity, improve pacing precision, and develop the control needed to execute your half-marathon with confidence.
Explore more training plans at GA Endurance
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.