Photo by RUN 4 FFWPU on Pexels
You’ve been putting in the work. Running most days, hitting your long runs, maybe even adding an extra session because you’re feeling motivated. And then something shifts. Your legs feel heavy on runs that used to feel fine. You’re tired in a way that sleep doesn’t fix. Your easy 6:00/km pace suddenly feels like it requires real effort.
This isn’t bad luck, and it’s not a sign you’re getting weaker. It’s your body telling you that the balance between training stress and recovery has tipped too far in the wrong direction. Overtraining — or more accurately, overreaching in its early stages — is one of the most common reasons everyday runners plateau, pick up injuries, or simply stop enjoying running altogether.
The frustrating part is that the natural response is to push harder. To assume you just need more miles, more effort, more discipline. Usually, the answer is the opposite.
What’s actually happening when you overtrain
Overtraining isn’t just about running too many miles. It’s about the cumulative load — training volume, intensity, life stress, sleep quality, nutrition — outstripping your body’s ability to recover and adapt. Your body gets stronger during rest, not during the run itself. When there’s not enough rest, adaptation stalls, and the stress simply accumulates.
Runners often confuse normal training fatigue with overtraining. Normal fatigue clears up after a rest day or two. Overtraining — particularly Overtraining Syndrome (OTS) in its more developed form — can persist for weeks or months and requires a structured approach to reverse. The British Journal of Sports Medicine has published extensively on this, noting that recovery from full OTS can take anywhere from weeks to over a year in severe cases.
Most everyday runners will hit a state called functional or non-functional overreaching before OTS sets in. Catching it at that stage matters enormously.
The physical signs you’re overtraining
These are the ones to pay close attention to, because they show up in your actual running before anything else:
- Your easy pace feels hard. If your usual comfortable effort — say, 6:00–6:30/km — now requires the kind of concentration it used to take at race pace, that’s a clear flag. Your perceived effort at the same pace is creeping up.
- Your heart rate is elevated. A resting heart rate 5–10 bpm higher than your baseline on multiple consecutive mornings is one of the most reliable early indicators. If you wear a watch that tracks overnight heart rate, start paying attention to that trend.
- Persistent muscle soreness. Delayed-onset muscle soreness (DOMS) after hard sessions is normal. Soreness that doesn’t clear between sessions — that’s different.
- Recurring minor injuries. Shin splints flaring up. A tight Achilles that won’t fully settle. Niggles that keep appearing because your tissues aren’t getting the recovery window they need.
- Getting ill more often. Overtraining suppresses immune function. If you’re catching every cold that comes around, your training load may be contributing.
The mental and emotional signs
These often get dismissed as “just life” — which is exactly why they’re worth naming directly:
- Dreading your runs. Not the normal “I don’t feel like it today” reluctance. A deeper dread or flat feeling that doesn’t lift once you’re out there.
- Irritability and low mood. This one is real and well-documented. High training loads without adequate recovery affect cortisol and mood — your family and colleagues may notice before you do.
- Poor motivation across all areas. Not just running. When you stop caring about things you normally enjoy, that’s your nervous system telling you it’s overwhelmed.
- Sleep problems. This is the cruel irony of overtraining — you’re exhausted but you can’t sleep properly. You wake early or lie awake even when you’re tired. This happens because elevated cortisol disrupts your sleep cycle.
A quick self-assessment: where do you sit?
Use this breakdown honestly. Be hard on yourself — not in the “push through” sense, but in the “actually assess what’s true” sense.
| Symptom | Probably normal fatigue | Worth paying attention | Likely overtraining |
|---|---|---|---|
| Tired legs | After a hard week | Most days, multiple weeks | Persistent even after rest days |
| Resting HR elevation | 0–3 bpm above baseline | 4–7 bpm above baseline | 8+ bpm for several days |
| Mood | Fine, minor irritability | Noticeably lower than usual | Low mood, dread, disengagement |
| Performance | Slight dip after hard blocks | Stalling for 2–3 weeks | Declining despite continued training |
| Sleep | Occasional poor nights | Regularly disrupted | Consistently poor, can’t recover |
| Motivation | Ebbs and flows | Frequently forcing yourself | Running feels like punishment |
If you’re sitting in the right column across two or more rows, don’t dismiss it.
Common reasons everyday runners overtrain
It’s rarely because you’re doing 100-mile weeks. For most runners reading this, overtraining sneaks in through more ordinary routes:
Too many hard days. A lot of runners effectively run at medium-hard effort most days — not easy enough to recover, not hard enough to meaningfully build fitness. Three sessions at 5:30/km effort with no real easy running in between is more stressful than one hard session bookended by genuine 6:30–7:00/km recovery runs.
Jumping mileage too quickly. The old rule of not increasing weekly mileage by more than 10% per week exists for a reason. Going from 30km to 50km in a month because motivation is high almost always catches up with you.
Life stress counts too. A brutal work period, poor sleep because of a newborn, travelling, under-eating — all of these reduce your recovery capacity. The same training load that was fine in September might be too much in January when work pressure is high and you’re sleeping six hours a night.
Racing too frequently. Running a parkrun hard every Saturday, a local race every few weeks, and trying to train in between doesn’t leave much room for adaptation. Racing takes more out of you than most people account for.
What to actually do about it
The answer to overtraining is recovery — but not just taking a day off and getting back to it. Here’s a practical approach:
Step 1: Take a genuine easy week. Cut your mileage by 40–50% and keep every run at a truly easy effort. If you usually run 40km per week, run 20km. No tempo runs, no intervals. This isn’t weakness — it’s how you get the adaptation from the training you’ve already done.
Step 2: Audit your hard sessions. Most runners need no more than two quality sessions per week (interval work, tempo runs, races). Everything else should be easy. Genuinely easy — 60–75% of your maximum heart rate, or a pace where you can hold a full conversation.
Step 3: Look at your sleep and food. This isn’t generic advice — overtraining is made significantly worse by under-fuelling. If you’re doing 50km weeks and eating at a calorie deficit, you’re digging a hole your body can’t climb out of. The National Health Service’s guidance on sports nutrition is a reasonable starting point if you’re not sure where your intake should be.
Step 4: Give it real time. If you’ve been in a hole for several weeks, one easy week won’t fix it. Expect two to four weeks before you start feeling like yourself again. Don’t panic when week one doesn’t feel dramatically better.
Step 5: Rebuild gradually. When you return to normal training, do it incrementally. Add one quality session back at a time. Watch your resting heart rate. If the signs return, you haven’t recovered fully yet.
How to prevent it next time
You don’t need to become obsessive about metrics, but a few habits make a real difference:
- Log your resting heart rate daily. Most GPS watches do this automatically. Look at the trend, not individual days.
- Plan recovery weeks deliberately. Every third or fourth week, drop your mileage by 30–40%. Build it into your plan, not just when things go wrong.
- Be honest about your easy pace. For most runners doing 5:00–6:00/km marathon pace training, easy runs should genuinely be at 6:30–7:30/km or slower. Slower than feels necessary.
- Don’t train through illness. A week off sick is not the problem. Training hard through illness and losing three months to injury or deep fatigue — that’s the problem.
The honest takeaway
- The most reliable early sign is a rising perceived effort at your normal easy pace — if 6:00/km suddenly feels like 5:00/km used to, take it seriously before it becomes a bigger issue.
- Overtraining is rarely about one big week — it builds over time through consistently insufficient recovery. Look at your last 3–4 weeks as a whole.
- An elevated resting heart rate of 8+ bpm above your baseline for several consecutive days is a concrete, trackable signal — use it.
- The fix is boring but real: cut volume, protect sleep, eat enough, and wait longer than you think you need to. Trying to train your way out of overtraining is how it becomes a month-long problem instead of a two-week one.
- Life stress and training stress sit on the same scale. A hard month at work means your training load needs to come down, not stay the same. That’s not an excuse — it’s how physiology actually works.