Can Walking Count Toward Your Weekly Mileage During Marathon Training?

# Can Walking Count Toward Your Weekly Mileage During Marathon Training?

Marathon training demands volume. Most plans target 40-60 miles per week at peak, with easy runs forming the foundation of that workload. The question runners face is whether walking can substitute for running during those lower-intensity days.

The short answer from run coaches: walking counts, but with caveats.

Walking produces aerobic adaptations. Your cardiovascular system improves when you sustain elevated heart rate over time, regardless of whether your feet leave the ground. A 2019 study in the Journal of the American Heart Association found that brisk walking (3.5 mph or faster) delivers comparable cardiovascular benefits to easy running for sedentary populations. The aerobic stress triggers mitochondrial development and improves VO2 max, though less efficiently than running.

However, the training stimulus differs. Running at 10-minute mile pace demands greater muscle recruitment, higher ground reaction forces, and more energy expenditure than walking. A 5-mile run burns roughly 600 calories for a 150-pound person. The same 5-mile walk burns around 300 calories. This matters for marathon training because your body adapts to the specific demands placed on it. Running trains your legs to handle impact at race pace; walking does not.

Coach Stacy Sims, exercise physiologist and endurance sports scientist, points out that easy runs serve multiple functions beyond aerobic conditioning. They build bone density, strengthen connective tissue, and acclimate your feet and joints to running-specific stress. Walking skips these benefits.

Where walking fits: recovery weeks, injury prevention, and volume supplementation. If you're recovering from a muscle strain or dealing with persistent soreness, substituting one easy run per week with a brisk 5-mile walk maintains aerobic fitness without aggravating the injury. During taper weeks, walking works as a maintenance tool.

The mileage counting question hinges on your goal. If you count walking miles toward total weekly volume, you must adjust your actual running volume accordingly. Some coaches suggest a 1.5:1 ratio. One mile of walking equals approximately 0.67 miles of running in terms of training stimulus. A 5-mile walk provides roughly 3.3 miles worth of aerobic stress compared to running.

For marathon-specific prep, most coaches recommend keeping 80-90% of weekly volume as actual running. Walking can fill the remaining 10-20% as supplemental activity. This preserves the running-specific adaptations your body needs while allowing flexibility during recovery or injury management.

The practical strategy: Count walking as part of active recovery or cross-training, not as direct substitution for your easy runs. Walk on non-running days. Use walking to extend your active streak during lighter weeks without adding impact stress.

Marathon success depends on accumulated running volume at race pace and lactate threshold efforts. Your long run, tempo work, and easy runs build that capacity. Walking maintains general fitness but cannot fully replace the running-specific stimulus your legs require. Walk freely during recovery days or as supplemental activity. Keep your actual running miles protected for the adaptations that matter on race day.