Is This Plan For You?

This 20-week Marathon Base plan by GA Endurance is designed for runners who want to build a strong, durable, and high-capacity aerobic foundation before progressing into race-specific marathon training.

It is ideal for athletes who are either returning to structured training or aiming to develop long-term endurance, consistency, and resilience required for advanced marathon performance.

If your goal is to establish a deep aerobic base, improve efficiency, and prepare your body for high-volume and race-specific workloads, this plan provides a clear and progressive pathway.

What You Can Expect

• A complete 20-week structured Base progression

• Gradual and controlled volume increase to support long-term adaptation

• Strong emphasis on aerobic capacity, efficiency, and movement economy

• Consistent, easy, and steady-state runs to build endurance durability

• Introduction of controlled tempo work to prepare for future intensity

• Progressive long runs to extend aerobic capacity safely

• Periodized recovery weeks to support adaptation and reduce injury risk

• Development of structural durability (tendons, muscles, connective tissue)

• Clear, easy-to-follow workouts using pace, heart rate, or perceived effort

• Optional strength guidance to support injury prevention and durability

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

• Be ready to follow a progressive endurance-focused structure

A GPS watch and heart rate monitor are recommended for best results.

Final Note

This 20-week base plan is designed to build the physiological and structural foundation required for high-level marathon performance.

You will develop aerobic capacity, improve durability, and establish the consistency needed to successfully transition into advanced marathon training.

Explore more training plans at GA Endurance