[Running]The most common mistake amateur runners make training for a marathon

[Jackson79]

The single biggest mistake is increasing weekly mileage too quickly. A commonly cited guideline caps weekly increases around ten percent, and plenty of eager first timers blow well past that in the excitement of early training, which is exactly how overuse injuries like shin splints and stress fractures show up a few weeks later, often forcing weeks of rest that sets the whole training block back further than the extra mileage ever would have helped.

A closely related mistake is running every single run at roughly the same moderate effort, rather than genuinely varying intensity across the week. Training plans built around easy runs, one harder workout, and a long run each serve a different physiological purpose, and running everything at the same middle intensity tends to produce a runner who is tired all the time but not actually getting meaningfully faster or more durable.

People also frequently undertrain the actual marathon distance mentally and logistically. Never practicing race day nutrition and hydration during long runs, then trying something completely new on race morning and dealing with genuine stomach issues at mile eighteen that could have been sorted out weeks earlier during training.

Another common trap is skipping strength training entirely under the assumption that running more is always the better use of limited training time. When a modest amount of strength work, particularly for the hips and core, meaningfully reduces injury risk and often improves running economy over a full training block.

The honest summary is that most first marathon disappointments trace back to enthusiasm outpacing patience. More miles, more intensity, and more speed all feel like progress in the moment, but a body needs genuine time to adapt, and respecting that timeline is usually the actual difference between a good race and an injured DNF