When you’re preparing for Wizz Air Sofia Marathon 2026, the temptation to squeeze in one more training session, a few extra kilometres or another long run is understandable – especially as race day gets closer.

But more training doesn’t always mean better preparation. To become stronger, your body needs not only training stress but also enough time to recover from it. When the balance between the two is disrupted for too long, progress can turn into declining performance.

So how can you tell the difference between normal fatigue after a hard training session and signs that you may be pushing yourself too far?

Feeling tired after training is normal. Feeling tired all the time isn’t

It is completely normal to feel tired after a long or intense run. With enough rest, your body should recover and become ready for the next training session.

A more important warning sign is when fatigue begins to accumulate. You wake up tired, your legs constantly feel heavy, familiar workouts suddenly require much more effort, and even after a rest day you don’t feel significantly better.

This may be your body telling you that it needs more time to recover.

Your performance is getting worse even though you’re training more

One of the most characteristic warning signs can seem contradictory: you increase your training, but your performance starts to decline.

A pace that previously felt relatively comfortable suddenly requires serious effort. Interval sessions become harder. Your heart rate may behave differently from usual at a familiar intensity, or you may simply feel that your body is not responding as it normally does.

One bad workout does not mean you are overtraining. Everyone has bad training days. But if the pattern continues across several sessions, it is worth paying attention.

Pay attention to your mood, not just your legs

Excessive training load can affect you away from the running course too.

Unusual irritability, lack of motivation, difficulty concentrating or the feeling that a training session you normally enjoy has suddenly become an obligation can all be part of the picture.

A combination of several signs is particularly worth noticing – for example, declining performance together with persistent fatigue, sleep problems and a loss of motivation to train.

Pay attention to your sleep

Intense training might make you expect to sleep better, but excessive training load can sometimes have the opposite effect.

Difficulty falling asleep, waking frequently during the night or feeling poorly recovered in the morning may indicate that your body is under too much stress.

Sleep is one of the most important parts of the training process. Recovery is when your body adapts to the training stress you have placed on it.

Pain that doesn’t go away deserves attention

Muscle soreness after a demanding session is familiar to almost every runner. But pain that persists, becomes stronger or changes the way you walk or run should not be ignored.

Persistent aches and pains may be a warning that your training load has exceeded your body’s ability to recover.

Don’t try to “run through” persistent pain. Taking a break or consulting a medical or sports professional early may prevent a much longer interruption to your training.

Monitor your heart rate – but don’t rely on your watch alone

If you regularly measure your resting heart rate, a persistent change from your usual values can be another indication that your body is not recovering optimally.

However, no single number on a sports watch can diagnose overtraining. Heart rate and other metrics are influenced by sleep, stress, temperature, illness, caffeine, hydration and many other factors.

It is more useful to look at trends and combinations of signals rather than one particular number.

Frequent illnesses can also be a warning sign

If an increase in training volume is accompanied by frequent infections, prolonged feelings of being unwell or the sense that you are constantly “about to get sick”, don’t automatically dismiss it as bad luck.

Your body may simply not have enough resources to recover properly between training sessions.

Nutrition and recovery matter too

Preparing for longer distances increases your energy requirements. If you increase your weekly mileage without consuming enough energy and nutrients, your recovery can suffer.

Unusual changes in appetite, persistent fatigue, declining performance and slower recovery are all reasons to look not only at your training plan, but also at your nutrition, hydration and sleep.

One symptom does not necessarily mean overtraining

There is an important distinction to make. True overtraining syndrome is a more serious and prolonged condition. Recreational runners are more likely to experience periods of accumulated fatigue or insufficient recovery.

One bad workout, two days of heavy legs or a single sleepless night do not mean that you have overtrained.

What matters more is the overall pattern. If several warning signs appear at the same time and continue despite rest, consider reducing your training load and, when necessary, seeking advice from a doctor or sports medicine professional.

Rest days are part of your training plan

For highly motivated runners, this can be one of the hardest lessons to learn.

A rest day is not a missed training session. It is part of your training.

Recovery days, easy runs and periods of reduced training volume give your body the opportunity to adapt. If every session is hard, sooner or later the quality of your training is likely to suffer.

Sometimes the best thing you can do for your preparation is not another kilometre, but a day without kilometres.

Don’t try to make up for missed workouts

Did you miss a few training days because of work, travel, illness or another reason? One common mistake is trying to squeeze all those missed kilometres into the following few days.

Your body does not work like a spreadsheet where every missing kilometre has to be filled in.

Return to your training plan gradually. A few missed sessions are unlikely to ruin your preparation. Trying to compensate for all of them at once, however, can increase your risk of excessive fatigue and injury.

The longer the distance, the more important recovery becomes

If you are preparing for the 5K, higher-intensity sessions still require sufficient recovery between demanding workouts.

For the 10K, gradually increasing your training volume and sensibly alternating harder and easier days becomes even more important.

For the 21K, long runs create significant fatigue, and not every long training session needs to prove how fit you are.

For the 42.195K marathon, the temptation to accumulate as many kilometres as possible can be particularly strong. But marathon fitness is not built in the final few weeks – and it certainly cannot be gained by desperately trying to compensate for missed training just before race day.

If you are taking part in the 2 × 21K relay, don’t underestimate the distance simply because you are sharing the marathon with a partner. Your 21 kilometres still require proper preparation, but there is no need to train as though you were running the entire marathon.

The final weeks are not the time to prove how much you can do

As Wizz Air Sofia Marathon 2026 approaches, doubts are completely natural: “Have I trained enough?”, “Should I do one more really long run?”, “What if I’m not ready?”

Don’t let pre-race anxiety suddenly push you into dramatically increasing your training load.

During the final stage of preparation, the goal gradually changes. It is no longer only about building fitness – it is also about reaching the starting line recovered, healthy and ready to use the fitness you have already built.

On October 10 and 11, you will have your opportunity to give your best on the streets of Sofia.

Until then, train wisely, listen to the signals your body is sending you and remember: recovery is part of the journey to the finish line too.