The Most Common Mistakes Runners Make When Marathon Training

Marathon training season rolls around every year, and with it comes motivation, new plans and big goals. But it also brings a familiar pattern: niggles, missed sessions, frustration, and in some cases, injury that stops training altogether. 

Most runners aren't doing anything "wrong" on purpose. In fact, many of the most common mistakes come from doing what seems logical. The problem is that marathon training places huge demands on the body, and without the right support, even the best intentions can backfire. 

Here are some of the most common mistakes runners make when preparing for a marathon - and what to do instead.

1. Doing Too Much, Too Soon

It's easy to get carried away early in a training block. You're feeling good, fitness is improving and ticking off long runs feels rewarding. But sudden increases in mileage or intensity are one of the biggest contributors to overuse injuries. 

The body adapts to load gradually. Muscles, tendons and joints often lag behind cardiovascular fitness, meaning you may feel capable of running more long before your tissues are ready to tolerate it. 

What to do instead:

Build volume progressively, respect recovery days and remember that consistency beats big jumps in mileage every time. 

2. Ignoring Strength Training

This is one of the most common gaps in marathon preparation. Many runners believe that running itself is enough to prepare the body for running. While running improves fitness, it doesn't necessarily build the strength needed to control movement, absorb impact and maintain form over long distance. 

Without adequate strength, the body compensates. Over time, this can lead to common marathon injuries such as knee pain, Achilles issues or hip discomfort. 

What to do instead: 

Incorporate strength and conditioning alongside your running. Focus on lower body strength, trunk control and single - leg stability to better support your running mechanics. 

3. Training Through Niggles

A tight calf. A sore knee. A stiff hip. Many runners treat these as normal and continue training through them, hoping they'll settle on their own. Sometimes they do - but often they don't. 

Niggles are usually early warning signs that the body is struggling to manage load. Ignoring them can turn a manageable issue into something that requires weeks off training. 

What to do instead: 

Address niggles early. This might mean adjusting training, improving recovery, or seeking professional input before the issue escalates. 

4. Underestimating Recovery

Recovery is often the first thing sacrificed when life gets busy. Sleep, nutrition, hydration and soft tissue work are pushed aside in favour of squeezing in another run.

But marathon training is only effective if the body is given time and resources to adapt. Without adequate recovery, fatigue accumulates and performance suffers. 

What to do instead: 

View recovery as part of your training, not an optional extra.  Fuel well, hydrate properly, prioritise sleep and use recovery strategies consistently throughout the block.

5. Following a Generic Plan That Doesn't Fit You

Online plans and apps can be useful, but they don't account for your injury history, lifestyle, strengths or weaknesses. What works for one runner may not work for another - especially over the course of a demanding marathon build. 

What to do instead:

Use a plan that reflects you. Personalised programming allows for smarter progression, better injury management and more sustainable training. 

Final Thoughts

Marathon training isn't just about logging miles. It's about preparing your body to handle the demands of running week after week. Strength, recovery and smart progression are what allow runners to train consistently and arrive at the start line feeling confident rather than broken. 

Avoiding these common mistakes doesn't mean training less - it means training better. 

If you're heading into marathon seasons and what to feel more prepared, resilient and supported, taking a more holistic approach to your training can make all the difference.