In marathon training, it is often the hardest workouts that get the most attention. Long runs, tempo sessions, and race-pace efforts tend to feel like the sessions that move fitness forward. But for most runners, the real foundation of marathon preparation is built on easy runs. They are what make consistent training possible, support aerobic development, and allow harder sessions to do their job.
Easy runs are essential because marathon performance depends heavily on aerobic endurance. Low-intensity running helps build that system without creating the same level of fatigue as harder workouts. Runner’s World notes that Zone 2 and other easy-paced runs improve endurance, aerobic capacity, fatigue resistance, and recovery, which is exactly what marathon runners need during a long training block.
They also protect the overall structure of a marathon training plan. When runners push too hard on days that are supposed to be easy, they carry unnecessary fatigue into long runs, workouts, and recovery days. Coaches interviewed by Runner’s World recently pointed to running easy runs too fast as one of the most common marathon training mistakes, because lighter sessions are designed to help the body recover and prepare for the next demanding effort.
That matters even more when weekly mileage begins to rise. Easy runs allow runners to add volume in a controlled way, which is critical for marathon endurance, aerobic base building, and injury prevention. Runner’s World also highlights that most base-building plans and endurance programs rely heavily on conversational-paced running, with the majority of weekly mileage staying easy to support long-term progress.
For marathon runners, this is the key distinction: easy does not mean unimportant. Easy runs are where consistency is protected, recovery is supported, and endurance is built quietly over time. They may not feel impressive in the moment, but they are one of the most important tools in any marathon training plan.
References
- Runner’s World, How to Run Faster: Why You Need Zone 2 Runs
https://www.runnersworld.com/training/a69253818/run-faster-program-why-you-need-zone-2-runs/ - Runner’s World, 7 Marathon Training Mistakes Coaches See Athletes Make
https://www.runnersworld.com/training/a70974512/most-common-marathon-training-mistakes/ - Runner’s World, This 12-Week Base-Building Plan Is Perfect for Beginner Runners
https://www.runnersworld.com/training/a69786605/beginner-running-base-training-plan-12-weeks/