Setting the Stage for Your London Marathon Plan

With just under four weeks to go until the London Marathon, most of the hard work is already behind you. The long runs are done, the routine is established, and your body has adapted to the demands of training.

At this stage, you are not trying to get fitter. You are trying to arrive on the start line in the best possible condition.

This is where things often start to unravel.

The final month is about protecting what you have built. It requires a shift in mindset that many runners struggle with. After months of pushing, it can feel strange to ease off or hold back. But this is exactly where races are often decided for amateur runners.

Small mistakes now can have a disproportionate impact. You are close enough to race day that fatigue lingers, and there is very little time to recover from setbacks. Knowing what to avoid is just as important as knowing what to do.

1. Trying to Cram Fitness Too Late

One of the most common mistakes in the final four weeks is trying to make up for lost time.

You might have missed a few sessions earlier in the plan, or had a long run that did not go quite as expected. That doubt can creep in and lead to the idea that you need to squeeze in more training to compensate.

The problem is that it does not work like that.

At this point, your body is unlikely to produce meaningful race-day gains compared with the fatigue risk. What it will do is build up fatigue. Extra mileage or harder sessions can leave you feeling heavy and under-recovered when you should be sharpening up. Late increases in training load are also associated with a higher risk of injury, particularly when progression has not been gradual (Eckard et al., 2018).

The most effective approach is to trust the work you have already done. Fitness is built over months, not in the final few weeks. Your job now is to let that fitness come through.

2. Turning Long Runs Into Race Efforts

As race day approaches, confidence often builds. You might feel stronger than expected, particularly during your final long runs. This is where runners tend to push the pace.

What starts as a steady run gradually turns into something closer to race effort. It can feel like a confidence boost or a final test.

In reality, it often works against you.

Hard long runs take longer to recover from, and that recovery cuts into the quality of your remaining training. Instead of feeling sharper week by week, you carry fatigue forward. Accumulated fatigue without adequate recovery is known to impair performance adaptations and increase the likelihood of overreaching (Lehmann, M., Foster, C., & Keul, J., 1993).

The purpose of these final long runs is not to prove fitness. It is to reinforce pacing, practise fuelling, and leave you feeling in control.

If you include sections at marathon pace, they should feel steady and repeatable. You should finish knowing you could have carried on, not feeling completely spent.

3. Mismanaging Niggles and Small Injuries

At this stage, it is very common to feel small aches and pains. After weeks of consistent running, your body is under repeated stress. Tight calves, mild knee discomfort, or general soreness are all fairly typical.

The issue is how runners respond.

Some ignore these early signs and carry on as normal, which can turn something manageable into a proper injury. Others panic and stop altogether, which can knock both fitness and confidence.

A more measured approach works better.

Rather than thinking in extremes, think in terms of adjustment. Slightly reducing volume, easing off intensity, or taking an extra rest day can often be enough to settle things down. Many running injuries are linked to repetitive loading and poor load management over time rather than a single session (Hreljac, 2004).

Small, sensible adjustments now can keep you progressing without escalating the problem.

4. Making Changes Too Close to Race Day

The final few weeks often bring a sense of doubt. Runners start questioning their plan, their kit, and their overall approach. This is when unnecessary changes creep in.

New shoes, different fuelling products, changes to running form, or adding unfamiliar exercises are all common.

Each of these introduces risk at a point where consistency matters most.

What has worked so far is what has got you here. Changing things now increases the chances of discomfort, poor performance, or injury.

Race day should feel like an extension of your training, not something completely different. The more familiar everything feels, the more confident you will be.

5. Getting the Taper Wrong

The taper is one of the most misunderstood parts of marathon training.

After months of building volume, reducing your running can feel counterintuitive. It is common to worry that you are losing fitness, particularly if you start to feel a bit sluggish.

This often leads to two mistakes. Some runners do not ease off enough and carry fatigue into race day. Others cut back too much and lose their sense of rhythm.

A well-managed taper reduces fatigue while keeping some intensity so you stay sharp. This balance between reduced volume and maintained intensity has been shown to support peak endurance performance (Mujika and Padilla, 2003).

It is also worth recognising that the taper can feel slightly odd. You might feel heavy one day and sharp the next. That is normal and usually settles in the final few days before the race.

6. Not Dialling In Your Fuelling Strategy

Fuelling is one of the biggest factors in marathon performance, yet it is often left too late.

If you have not practised your fuelling strategy during training, race day becomes unpredictable. You do not know how your stomach will respond or what timing works best for you.

Carbohydrate intake plays a key role in maintaining pace over long distances and delaying fatigue during endurance events (Burke et al., 2011). The final long runs are your chance to refine this.

By race day, your approach should feel familiar. You should know what you are taking, when you are taking it, and how your body responds.

7. Letting External Stress Affect Your Training

Training does not exist in isolation. Work, family, sleep, and general life stress all affect how your body responds.

In the final few weeks, these factors become even more important. If stress levels are high and you continue to push training as normal, recovery can suffer.

This can leave you feeling flat, increase the risk of illness, or contribute to injury. Overall training load is influenced by both physical and non-physical stressors, which together affect adaptation and performance (Saw, Main and Gastin, 2016).

Being aware of your overall load is key. If life is particularly busy or stressful, it makes sense to adjust your training slightly. That is not a setback. It is a way of maintaining consistency without overloading yourself.

8. Starting the Race Too Fast

The final mistake happens on race day, but it is shaped by how you approach the final weeks.

London is a unique atmosphere. The crowds are loud, the energy is high, and the early miles often feel easier than expected. It is very easy to get carried away.

The marathon, however, tends to punish early mistakes.

Running too quickly in the opening miles increases fatigue later on, often leading to a noticeable drop in pace towards the end. What felt comfortable early becomes difficult to sustain once the race starts to bite (Sha et al., 2024).

A controlled start gives you the best chance of finishing well. Settling into your planned pace gradually, even if it feels slightly slow at first, is one of the most effective strategies you can use.

Start Training With A Plan That Actually Fits Your Life

If you are ready to train with purpose instead of guessing your way through workouts, our personal trainer in Harpenden services are built to support you. At Conroy Performance, we take time to understand your goals, schedule, and training history so every session moves you forward. 

Whether you want to get stronger, feel fitter, or rebuild confidence after time away from exercise, we are here to guide you. If you have questions or want to book your first session, contact us today.

References

Eckard, T. G., Padua, D. A., Hearn, D. W., Pexa, B. S., & Frank, B. S. (2018). The Relationship Between Training Load and Injury in Athletes: A Systematic Review. Sports medicine (Auckland, N.Z.), 48(8), 1929–1961. https://doi.org/10.1007/s40279-018-0951-z

Hreljac, A. (2004). Impact and overuse injuries in runners. Medicine & Science in Sports & Exercise, 36(5), pp. 845–849. https://doi.org/10.1249/01.MSS.0000126803.66636.DD  

Lehmann, M., Foster, C., & Keul, J. (1993). Overtraining in endurance athletes: a brief review. Medicine and science in sports and exercise, 25(7), 854–862. https://doi.org/10.1249/00005768-199307000-00015. 

Mujika, I. and Padilla, S. (2003). Scientific bases for precompetition tapering strategies. Medicine & Science in Sports & Exercise. Available at: https://pubmed.ncbi.nlm.nih.gov/12840640/

Saw, A.E., Main, L.C. and Gastin, P.B. (2016) Monitoring the athlete training response: subjective self-reported measures trump commonly used objective measures: a systematic review. British Journal of Sports Medicine, 50(5), pp. 281–291. Available at: https://bjsm.bmj.com/content/50/5/281

Sha, J., Yi, Q., Jiang, X., Wang, Z., Cao, H., & Jiang, S. (2024). Pacing strategies in marathons: A systematic review. Heliyon, 10(17), e36760. https://doi.org/10.1016/j.heliyon.2024.e36760