Overtraining in beginners: warning signs you shouldn't ignore

You’ve been training for three months. At first you felt on top of the world, but now lifting the same weight as two weeks ago feels hard, you’re sleeping worse, and on Mondays you can’t even be bothered to tie your trainers. You’re not lazy. You may simply be loading more than your body can recover from.

This guide is aimed at beginners and early intermediates (less than 12 months of consistent training), which is exactly the group where enthusiasm outpaces recovery capacity. If you’re an advanced athlete with a plan and a coach, this will fall short for you.

What overtraining is and why it affects beginners most

Overtraining (overtraining syndrome, OTS) is a prolonged imbalance between training load and recovery. It’s not being tired for a day. It’s a state of fatigue that isn’t fixed by a nap or a weekend off training.

Before reaching clinical OTS, there are two phases: functional overreaching (fatigue lasting days, resolved with short rest) and non-functional overreaching (fatigue lasting weeks, with a drop in performance). Full OTS can take months to resolve (Meeusen et al., 2013, Medicine & Science in Sports & Exercise).

Why are beginners vulnerable? For three specific reasons:

• They increase volume and intensity at the same time (a classic mistake).
• They lack the aerobic base and tendon strength to absorb that load.
• They confuse “training hard” with “training flat out every day”.

Early physical warning signs you shouldn’t ignore

These appear first. If you’ve had two or more of them for two weeks, sound the alarm.

Sign	What to watch	Alert threshold
Resting HR	On waking, before getting up	+5-10 bpm above your usual average for 3-5 days
Muscle fatigue	Legs feeling “heavy” during warm-up	Lasts more than 72 h without training
DOMS	Delayed muscle soreness	Lasts more than 4 days or appears with loads you used to tolerate
Performance	Usual sets, paces or weights	Drop 5-10% for no clear reason over 1-2 weeks
Sleep	Hours and quality	Sleeping worse despite being more tired

Resting heart rate is the cheapest and most reliable metric. If you want to understand what your number means, this piece on resting heart rate and when to worry is worth reading.

Psychological and behavioural signs

The least obvious and most ignored. They tend to appear at almost the same time as the physical ones.

• Irritability without a clear cause, especially on the days before training.
• Lack of motivation for a session you used to look forward to.
• Difficulty concentrating at work or while studying.
• Anxiety at the thought of skipping a day (a symptom, not a virtue).
• Altered appetite: it either spikes or disappears.

In endurance athletes, mood changes correlate with fatigue markers before objective performance drops (Kreher & Schwartz, 2012, Sports Health).

Physiological and hormonal signs

Evidence is limited in beginners here because most studies involve elite athletes. Even so, the usual patterns are:

• Recurrent infections: colds every 3-4 weeks, recurring sore throats.
• Non-specific digestive problems.
• Altered menstrual cycle in women (amenorrhoea, oligomenorrhoea): see a doctor, this is not “normal for training”.
• Persistently low libido.
• Wounds or grazes that take long to heal.

If you train under high load in the colder months, look after your defences especially: here’s how to train in autumn without getting sick.

How to prevent overtraining as a beginner

Gradual progression: the 10% rule

Increase your total weekly volume (kilometres, sets, tonnage) by 5-10% per week at most, with a deload week every 3-4 weeks (cut volume by 30-40%, keep intensity). This isn’t dogma, just a sensible framework to avoid overdoing it.

Monitor resting HR and RPE

Two simple tools:

• Resting HR on waking, using a heart rate monitor or watch. Record your baseline for 7 days and use that average as your reference.
• RPE (rating of perceived exertion, 1-10 scale) after each session. If your RPE rises for the same session week after week, something is off.

RPE is useful because it needs no equipment; here’s a guide on using it well.

Sleep and eat enough

• Sleep: 7-9 h. Chronically sleeping under 6 h reduces protein synthesis and raises cortisol.
• Protein: 1.6-2.2 g/kg/day if you train strength or endurance regularly.
• Carbohydrates: don’t cut them aggressively while you’re increasing load. Energy deficit is fuel for OTS.

Real rest days

At least 1-2 days a week without structured training. Walking or stretching counts as active rest, not as a session.

Common beginner mistakes

1. Training 6-7 days a week from month one. The body needs time to adapt: tendons and connective tissue take longer than muscle.
2. Confusing tiredness with progress. Ending up wrecked every day isn’t a sign of good training, it’s a sign of poor load distribution.
3. Ignoring DOMS that lasts days. It’s a warning that the load was too high for your current level.
4. Skipping deload weeks because “I feel fine”. Deloading prevents problems; it doesn’t fix them.
5. Not eating enough while trying to lose weight and build muscle at the same time. Poorly managed deficit accelerates fatigue.

Warning: if you have a heart condition, are pregnant, postpartum or recovering from an injury, consult your doctor or physiotherapist before adjusting load. If you’re returning after a long break, review the 5 rules to avoid relapsing after an injury.

What to do tomorrow if you suspect you’re overtraining

1. Measure your resting HR tomorrow on waking and compare it with your average. If it’s +7 bpm or more, lower intensity today.
2. Cut volume by 40-50% this week, keeping one light session to maintain the habit.
3. Prioritise sleep and food: go to bed 30-60 min earlier and add a meal with carbohydrates and protein after training.

If within 10-14 days you don’t notice a clear improvement, see a sports medicine doctor. Established overtraining can require weeks or months of rest.

Frequently asked questions

How long does it take for overtraining to appear in a beginner?

It depends on the load, but rarely before 4-6 weeks of poorly dosed training. Typically functional overreaching appears within 2-3 weeks, which, if not corrected, evolves into non-functional overreaching within 1-2 months.

How do I tell overtraining apart from simply being unfit?

Being unfit improves with consistent sessions. Overtraining gets worse when you train and improves when you rest for several days. If your performance drops despite training more, that’s a warning sign.

Does strength training also cause overtraining?

Yes. It usually shows up as stalled loads, tendinopathies and nervous system fatigue. Poor sleep and adding sets without planning are the most common triggers.

Is a heart rate monitor useful for detecting it?

Yes, especially for measuring resting HR and heart rate variability (HRV). It doesn’t replace how you feel, but it gives an objective daily data point that helps you decide whether to train hard or deload.

Can I keep training lightly while I recover?

In early phases, yes: walking, very easy cycling or mobility work. With established overtraining, complete rest for 1-2 weeks is usually the first step before reintroducing progressive load.

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