Is This Plan For You?
This 12-week Half Marathon Base plan by GA Endurance is designed for runners who want to build a deeper and more consistent aerobic foundation before progressing into more advanced training.
It is ideal for intermediate athletes who can comfortably run 8–12 km and are ready to improve endurance, pacing precision, and steady-state strength through a structured and data-driven system.
If you are looking for a balanced development phase that strengthens your aerobic system while maintaining control and consistency, this plan provides a clear and effective pathway.
What You Can Expect
• A structured 12-week Base progression designed for intermediate runners
• Gradual and controlled increase in volume with clear intensity management
• Strong emphasis on aerobic capacity and steady-state strength development
• Long runs and steady sessions to improve endurance and 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 12-week base development phase
A GPS watch or heart rate monitor is strongly recommended for best results.
Final Note
This 12-week Base plan is designed to strengthen your aerobic system, improve pacing control, and build long-term endurance durability.
It creates a stable and reliable foundation that allows you to transition into longer or more performance-focused training phases with confidence.
For best results, continue your progression with a longer structured plan at:
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.