This Coach Has a Simple Benchmark for Determining If You’re Ready to Train for a Marathon.
Runner's World
February 20, 2026
AI-Generated Deep Dive Summary
If you're wondering whether you're ready to take on a marathon, Christine Rockey, an RRCA-certified run coach and principal lecturer at Coastal California University, has a straightforward test: If you can run three miles consecutively without stopping, you might just be ready to start training for 26.2 miles. This simple benchmark not only builds the physical foundation but also instills the mental discipline needed for long-distance running.
The ability to complete three miles straight is more than just a fitness milestone—it’s a key indicator of your body's readiness to handle the demands of marathon training. Running this distance helps you develop an aerobic base, which enhances your body's efficiency in using oxygen to fuel prolonged activity. It also strengthens your muscular and skeletal systems, preparing them for the repetitive impact of running longer distances. Additionally, maintaining a consistent pace during three miles teaches you to control your effort and avoid overexertion, skills that are crucial for endurance events.
Beyond physical preparedness, completing three miles without stopping fosters consistency in your training routine. This habit is essential for building the mileage necessary for marathon training. While there’s still work ahead—gradually increasing distance and intensity—you’re already on the right track by mastering this foundational challenge. Whether you're a seasoned runner or just starting out, this simple test can serve as a confidence-boosting stepping stone toward achieving your marathon goal.
For anyone looking to break into long-distance running, understanding your readiness is half the battle. Rockey’s approach demystifies the process, showing that even small achievements like completing three miles can set you on the path to bigger accomplishments. By focusing on what your body can already do—instead of fixating on what it can’t yet—you create a solid foundation for success in marathon training and racing.
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Originally published on Runner's World on 2/20/2026