Overtraining or Just Tired? How to Read the Signs
“I’m training harder than ever and getting slower. I’m exhausted all the time. Is this normal, or am I doing something wrong?”
Both can be true, and telling them apart is one of the most useful skills an endurance athlete can have. A bit of tiredness in a hard training block is normal and even necessary. Digging yourself into a hole where you get slower, flatter and more injury-prone is not.
This matters twice as much for women, because the early signs get waved away. Tired mum. Busy at work. Hormones. Sometimes it genuinely is fatigue that needs managing, and sometimes it is a warning sign worth respecting. Here is how to tell.
Normal hard training makes you tired for a few days. That is called functional overreaching, and after a rest it makes you fitter. It is the whole point of a hard block.
Push too hard for too long without enough recovery or fuel, and you slide into a deeper hole where performance drops for weeks and does not bounce back with a couple of easy days. The difference is not how tired you feel. It is how quickly you recover once you back off.
Normal Tiredness Versus a Warning Sign
Here is the honest split. One side is expected. The other is your body asking you to change something.
- Legs feel heavy for a day or two after a hard session, then come back.
- You are ready for your rest day and feel better after it.
- Sleep is broadly fine. Mood is broadly fine.
- Performance is steady or improving over weeks.
- A lighter few days and you feel sharp again.
- Performance is getting worse despite training more. Paces that were easy now feel hard.
- Heavy legs and flatness that do not lift after rest days.
- Sleep is disrupted even though you are shattered.
- Mood has dropped, motivation has gone, you are irritable or low.
- You are getting every cold going. Niggles and injuries are stacking up.
- Resting heart rate is unusually high or your morning readiness metrics look off for days.
- Your period has changed or stopped. This is a red flag, not a bonus.
If several of the warning signs are showing up together and sticking around, that is not a day-off problem. That is a step-back-and-reassess problem.
A quick weekly self-check to catch the warning signs early, plus the numbers worth tracking. Know when to push and when to back off. PDF, straight to your inbox.
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Before you assume you are training too much, ask whether you are fuelling too little. In women, what looks like overtraining is very often under-fuelling. Not eating enough to support your training load quietly wrecks your recovery, your hormones and your performance. The symptoms look almost identical to overtraining.
This has a name in sport science: low energy availability, and left unchecked it leads to a serious condition affecting bones, hormones and heart health. A changed or missing period is one of the clearest signals. If that is you, the fix is usually more food, not less training. I go deep on this in my guide to under-eating and fuelling properly.
You feel flat, so you assume you are unfit and train harder, while also quietly eating less to “earn” it. That combination digs the hole faster than anything.
Fix: when in doubt, eat more and rest more before you train more.
What To Track
You do not need fancy kit, though it can help. The most useful signals are simple and honest.
- How you feel out of ten each morning, logged honestly over time.
- Perceived effort on key sessions. Rising effort for the same pace is a clue.
- Sleep quality and quantity.
- Resting heart rate, or a readiness or HRV score if you wear a watch or ring. Watch the trend, not one bad night.
- Your cycle. Changes are information.
- Mood and motivation. A persistent drop is data, not weakness.
What To Do When You Spot It
- Take a deload. A lighter week with reduced volume and intensity lets your body absorb the work. This is planned into good programmes every few weeks, not just used as a rescue.
- Eat more, especially carbohydrate and protein. Fuel is the foundation of recovery.
- Prioritise sleep above almost everything else.
- If you have backed off properly and still feel wrecked after a couple of weeks, see your GP. Rule out things like low iron, thyroid issues and other medical causes.
- Come back gradually. Do not immediately slam back into full training and undo the reset.
The best athletes are not the ones who train the hardest. They are the ones who recover well enough to train hard again, week after week, year after year. Recovery is not the reward for the work. It is part of the work.
Why Women Are More Vulnerable to This
Women are not more fragile, but a few things stack up that make the under-fuelling version of this more common and easier to miss.
Chronic under-fuelling is widespread. A lot of women eat less than their training demands, often without realising, because diet culture has normalised it. That is the fastest route into the hole.
The mental load is real. Many of the women I coach are carrying work, kids and a household on top of training. Life stress and training stress draw from the same account.
The signs get dismissed. Exhaustion gets waved off as being a busy mum or just hormones, so the warning lights get ignored for longer.
Iron loss. Menstruation means women are more prone to low iron, which produces fatigue that looks a lot like overtraining but needs a completely different fix.
None of this means women should train less. It means the whole picture, fuel, life load, iron and recovery, has to be watched, not just the training.
The Bigger Risk: Low Energy Availability
It is worth naming the serious end of this properly. When you consistently do not eat enough to cover both your training and your basic body functions, you develop what sport science calls low energy availability. Left unaddressed it becomes a syndrome that affects bone health, hormones, metabolism, immune function and heart health, in both women and men.
The clearest early warning in women is a period that becomes irregular or stops. That is your body switching off a system it considers non-essential because it does not have the energy to run it. It is not a sign you are lean and fit. It is a sign something needs to change. If this is you, please treat it seriously and speak to your GP. The answer is almost always more food and less pressure, not more training.
How Long Does Recovery Take?
This is where the overreaching versus overtraining distinction really pays off.
Functional overreaching: a few days to a week of feeling flat, then you bounce back sharper. Normal and useful.
Non-functional overreaching: performance stays down for weeks. You need a proper block of easier training and better fuelling to climb out.
Overtraining syndrome: the deep version, where recovery takes months. This is the one you really want to avoid, and it is avoidable by catching the earlier stages.
The pattern is clear. The earlier you notice and act, the shorter the road back. Ignore it and the cost goes up fast.
Building a Week That Does Not Break You
The best way to deal with overtraining is to build a week that rarely lets you get there. Prevention beats rescue every time. This is how I structure it for the women I coach.
- Hard days hard, easy days easy. Most of your training should be genuinely easy. Save real intensity for one or two sessions and do them properly. The grey-zone middle, always moderately hard, is what quietly grinds women down.
- At least one full rest or very easy day. Non-negotiable. Rest is where the adaptation happens.
- Fuel the load. Eat enough, every day, with carbohydrate around your hard sessions and protein across the day. This is the single biggest lever.
- Protect sleep. It is the most powerful recovery tool you have, and free.
- Plan deloads. Every three or four weeks, a lighter few days so fatigue never fully stacks up.
- Watch life stress, not just training stress. A brutal work week or a run of bad nights with the kids counts. Adjust the training down when life is loud.
Do those consistently and you spend your training life on the right side of the line, tired in a good way, getting fitter, rather than digging holes and climbing out of them.
A Word on Watches and Wearables
Recovery scores, heart rate variability and readiness metrics from watches and rings can be genuinely useful, but treat them as one input, not the truth. A few honest pointers.
Watch the trend over a week or two, not a single bad number. One poor night after a glass of wine or a restless kid is noise.
These metrics do not know you are a woman with a cycle. Your resting heart rate and readiness can shift across your cycle, so factor that in rather than panicking.
The best data is still free and honest: how you feel out of ten, how your sessions are going, and how you are sleeping. If the watch says you are recovered but you feel wrecked, trust yourself.
Do not let a red recovery score become an excuse to skip everything, or a green one become permission to hammer yourself into the ground. Use it as a nudge, not an order.
When to See Your GP
Most tiredness is a fuelling, sleep and load problem you can fix yourself. But some fatigue has a medical cause, and pushing harder will not touch it. See your GP and ask for the right checks if any of these apply to you.
You have backed off, slept and eaten well for a couple of weeks and still feel wrecked.
You are breathless, dizzy, or your heart is doing odd things.
Your period has become irregular or stopped.
You are constantly flat and cold, which alongside heavy periods can point to low iron worth testing.
Your mood has dropped and stayed down. Persistent low mood deserves proper support, not just a rest day.
Asking for help is not a weakness or an overreaction. It is exactly what a serious athlete does when the body is sending signals that training tweaks cannot explain. Rule out the medical stuff, then get back to building.
The Short Version
A few days of tiredness after hard training is normal and makes you fitter. Weeks of getting slower is not.
The test is recovery speed: normal tiredness lifts after rest, a warning sign does not.
Watch for falling performance, disrupted sleep, low mood, frequent illness, niggles, a high resting heart rate and cycle changes.
In women, under-fuelling often masquerades as overtraining. A changed or missing period is a red flag.
Track how you feel, perceived effort, sleep, resting heart rate and your cycle.
When you spot it: deload, eat more, sleep more, and see your GP if it does not lift.
Listen to the signals early and you rarely end up in the hole. It is what it is. Rest is not quitting.
This article is general information, not medical advice. Persistent fatigue, a missing period, or a sudden drop in performance can have medical causes and deserve a conversation with your GP.
- You are training more and somehow getting slower, and you cannot work out why
- You are exhausted all the time and putting it down to being busy
- You suspect you might be under-fuelling but are scared to eat more
- You want a plan with recovery built in, from a coach who watches the whole picture
If you ticked two or more, this is exactly what I help women with.
Apply to work with me →If you want training that builds in recovery and fuelling properly, so you get stronger instead of stuck, that is what I do.
Female-specific endurance coaching with weekly check-ins on stress, sleep, energy and fuelling. Performance without punishment.
The application takes two minutes. I read every one myself. I will WhatsApp you within 24 hours on weekdays.
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