Is This Plan For You?
This 16-week Marathon Intermediate Base plan by GA Endurance is designed for runners who already train consistently and want to build a strong aerobic foundation before transitioning into a structured marathon training block.
It is ideal for athletes who have basic endurance but want to further develop consistency, durability, and efficiency through a structured, progressive base phase.
If you are looking for a balanced and effective approach to improve endurance capacity while preparing your body for more demanding marathon-specific training, this plan provides a clear and controlled pathway.
What You Can Expect
• A complete 16-week structured Base progression for Marathon Intermediate athletes
• Moderate-duration base phase with controlled and progressive load increase
• Strong emphasis on aerobic development and movement consistency
• Progressive long runs to build endurance, durability, and fatigue resistance
• Predominantly easy and steady-state running with limited structured intensity
• Gradual introduction of light tempo and neuromuscular work in later weeks
• Strategically placed recovery weeks to support adaptation and reduce injury risk
• Focus on consistency, pacing control, and efficient movement patterns
• 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 10–14 km
• Train consistently 3–4 times per week
• Have a basic aerobic base and recent running experience
• Be ready to follow a progressive and structured base phase
A GPS watch and heart rate monitor are recommended for best results.
Final Note
This 16-week intermediate base plan is designed to lay a solid, sustainable foundation for marathon training.
With a slightly shorter base duration, the focus remains on consistency, aerobic development, and durability. If followed with discipline, this plan will prepare your body to transition smoothly into more advanced and performance-focused marathon training phases.
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.