[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

[BrightRunner]

Adding to this, mental training gets overlooked too. Mile twenty onward is as much a psychological challenge as a physical one, and nobody practices that specific discomfort in advance

[Violet Tiger]

The same effort every run mistake describes basically my entire first training cycle.

Ran everything at a moderate pace and ended up tired constantly without actually getting faster. Never really thought about it that way before

[CosmicRay40]

Race day nutrition practice is the one nobody warns you about enough. Tried a new gel at mile twenty during my first marathon and spent the last six miles in genuine gastrointestinal distress that could have been avoided with one practice run

[CollapseState75]

The DNF framing at the end is sobering in a useful way. Most people training for their first marathon are thinking about finish time rather than quite just finishing at all

[RedCougar]

The ten percent rule saved my second marathon attempt after blowing right past it and getting a stress fracture during my first training block.

Painful and expensive lesson to learn the hard way

[Gaz_23]

Interested in how much of this advice changes for someone attempting a second or third marathon versus a genuine complete beginner tackling the distance for the first time.

Held up well

[Donna48]

The strength training point deserves way more emphasis.

Added two sessions a week to my own last training block and injury free training became noticeably easier to sustain for the first time

[DeBruyne75]

Strong list, though I'd add that sleep and recovery get skipped just as often as strength training. People obsess over the actual runs and completely ignore what happens between them

[HeartbreakKid_Royale]

Fell prey to the mileage excitement problem.

Early training just feels so good that dialing back on purpose clearly goes against every instinct

[Paige5]

Really useful summary! The patience point ties everything together well, almost every specific mistake listed here really just comes down to wanting progress faster than a body can actually safely adapt