Overtraining: overreaching, warning signs and recovery
Being tired after a hard block is normal. Weeks of falling performance are not. Here is how to tell the difference and what to do about it.
Getting stronger means pushing past what you can comfortably recover from, then letting your body catch up. That is the point of training. Problems start when the catching up never happens. True overtraining syndrome is uncommon in recreational lifters, but the milder versions are not, and they are much easier to fix if you spot them early.
Three stages, not one
The European College of Sport Science and the American College of Sports Medicine published a joint consensus statement on this in 2013 [1]. It describes a continuum:
| Stage | What happens | Recovery time |
|---|---|---|
| Functional overreaching | A short-term dip in performance after a hard block, followed by improvement once you recover | Several days to several weeks [1] |
| Non-functional overreaching | Performance stagnates or falls, often with fatigue, low mood or poor sleep | Weeks or months [1] |
| Overtraining syndrome | Prolonged maladaptation, with a long-term drop in performance across several body systems | Several weeks or months [1] |
Functional overreaching is often planned. A tough block followed by a deload is a deliberate version of it. The other two are not useful: you end up weaker and more tired, not fitter.
The consensus statement is clear that there is no single test to diagnose overtraining syndrome [1]. Non-functional overreaching and overtraining syndrome can look the same, and the difference is often only clear afterwards, from how long recovery takes [1]. Overtraining syndrome is diagnosed by ruling out everything else [1].
Warning signs
The consensus lists a cluster of signs rather than one marker [1]. Watch for several of these together, lasting more than a week or two:
- Performance going backwards despite normal training, such as weights you handled easily feeling heavy for weeks
- Persistent fatigue that a few easy days do not shift
- Low mood, irritability or loss of motivation to train
- Poor sleep, even when you are exhausted
- Normal sessions feeling much harder than usual
- Getting ill more often, particularly coughs and colds [1]
A run of low HRV or a raised resting heart rate can support the picture, but they move for many reasons. See resting heart rate and HRV for how to read them.
It is not only about training
The consensus statement stresses that training load is only part of the story [1]. Other stressors it names include:
- Sleep. Sleep disturbance is a recognised contributor [1]. Adults should get 7 or more hours a night [2], and sleep loss measurably reduces performance [3]. See sleep and recovery.
- Nutrition. Eating too little for the training you do, including too little carbohydrate, is a major trigger [1]. The International Olympic Committee describes a wider syndrome, relative energy deficiency in sport (REDs), where low energy availability harms both health and performance in men and women [4]. Long, aggressive cuts are the classic way lifters end up here. See cutting and bulking and maintenance calories. If you have a history of eating disorders, work with a professional rather than tracking numbers closely.
- Life stress. Work, relationships and money all count [1]. In a 12-week study of 135 students doing the same lifting programme, those under high life stress gained significantly less on bench press and squat than those under low stress [5].
- Illness. Upper respiratory infections are common in overreached athletes, and training hard through illness adds to the load [1].
This is why two people can run the same programme and one thrives while the other burns out.
What to do about it
The consensus recommendations [1] translate into a simple plan:
- Keep a training log and act when performance drops for more than a couple of weeks, rather than pushing harder.
- Build in rest. The consensus suggests at least one full rest day each week [1], plus regular lighter weeks.
- Avoid monotony. Vary intensity across the week rather than going hard every session.
- Fix the basics first: sleep, eating enough (especially in a long cut) and managing stress.
- If you are already in it, reduce training. Rest and reduced load are the treatment [1]. A deload is usually enough for functional overreaching. Non-functional overreaching may need a longer spell of easy training.
Do not try to train your way out of it. Adding volume to a body that is not recovering makes things worse.
When to see a doctor
Many medical conditions cause tiredness and falling performance. The consensus lists conditions to rule out, including anaemia, iron deficiency, thyroid and adrenal problems, diabetes and infections, and suggests blood tests such as a full blood count, C-reactive protein, thyroid function and ferritin [1]. The NHS advises seeing a GP if you have felt tired for a few weeks without knowing why, if tiredness is affecting daily life, or if it comes with other symptoms such as weight loss or mood changes [6].
See a doctor sooner if you have chest pain, palpitations, fainting or breathlessness that is out of proportion to the effort, or if low mood is severe. If you take any prescribed hormone or other medication, mention it, as it may be relevant to your symptoms and blood results. For what common tests show, see bloodwork for lifters.
Tracking it in ETS
ETS gives you the training log the consensus recommends: sets, reps and weights with personal bests and estimated 1RM, so a sustained drop in performance is easy to see. Sleep, resting heart rate and HRV from your watch feed the daily readiness score, and the weekly report puts them side by side with your training. Programmes with built-in deload weeks help you plan recovery before you need it.
Sources
- Meeusen R, et al. Prevention, diagnosis and treatment of the overtraining syndrome: joint consensus statement of the European College of Sport Science and the American College of Sports Medicine. Medicine and Science in Sports and Exercise, 2013. PDF
- Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. Journal of Clinical Sleep Medicine, 2015. AASM (PDF)
- Craven J, et al. Effects of acute sleep loss on physical performance: a systematic and meta-analytical review. Sports Medicine, 2022. PMC
- Mountjoy M, Ackerman KE, Bailey DM, et al. 2023 International Olympic Committee's (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs). British Journal of Sports Medicine, 2023. NIH Brage repository
- Bartholomew JB, Stults-Kolehmainen MA, Elrod CC, Todd JS. Strength gains after resistance training: the effect of stressful, negative life events. Journal of Strength and Conditioning Research, 2008. Penn State
- NHS. Tiredness and fatigue. NHS. nhs.uk
More on recovery
Last reviewed 7 October 2026. General information, not medical advice. Found a mistake? Email [email protected].