Overtraining: the signs you're
doing too much (and how to recover)

When you get back into training past 40 with a drive to make up for lost time, you quickly fall into a trap nobody sees coming: doing too much. You stack up sessions, add cardio, feel guilty about rest days — and instead of progressing, you stall, you get hurt, you burn out. This is overtraining, a state that's often under-diagnosed because, at first glance, it looks like motivation. Learning to recognise it means protecting both your results and your health.

Overtraining: the trap for the over-40s making up for lost time

Overtraining isn't reserved for elite athletes. It particularly stalks those returning to activity after years off who, carried by enthusiasm, want to go fast. The flawed reasoning is simple: if one session does you good, six sessions should do six times better. Except the body doesn't work that way. Progress isn't built during the effort, but during the recovery that follows. Training creates the stimulus; rest is what turns that stimulus into adaptation.

After 40, this mechanism becomes even more decisive. Recovery is naturally slower, tendons less elastic, and the hormonal balance that supports repair — testosterone, growth hormone — declines gradually. Loading ever more without giving the body time to rebuild is like digging a debt that always comes due in the end. Overtraining isn't "too much exercise" in absolute terms: it's too much exercise relative to your current recovery capacity.

The physical signs: when the body sounds the alarm

Overtraining's first language is physical. The signals rarely appear in isolation; it's their accumulation, and above all their persistence, that should raise a flag. Here are the most telling ones, the ones I most often see in people doing too much without realising it.

Meeusen R et al. — Med Sci Sports Exerc 2013: prevention, diagnosis and treatment of overtraining syndrome (ECSS/ACSM consensus) →  ·  Kreher JB & Schwartz JB — Sports Health 2012: overtraining syndrome, a practical guide →

The mental signs: mood as a barometer

Overtraining doesn't only hit the muscles. The nervous system and hormonal balance are on the front line, and it shows up in your mood well before performance collapses. Unusual irritability, a diffuse edginess, trouble concentrating are often the first clues — all the more deceptive because we readily blame them on work or everyday stress.

The most revealing signal remains the loss of motivation. When the very idea of going to train, once a pleasure, becomes a heavy chore, it isn't a lack of willpower: it's often the body asking for a break. This shift frequently comes with a low mood, a dip in libido and a diffuse sense of exhaustion. These mechanisms overlap heavily with those of chronic stress and cortisol, which blocks fat loss: cortisol kept high by an excessive training load sustains exactly this picture. Listening to your motivation means reading a reliable barometer of your recovery.

Normal fatigue or overtraining? Telling them apart

Not all fatigue is overtraining, and it's important to say so: a demanding effort should leave its mark. Soreness after a big session, the tiredness of a packed week, the need to ease off for a day or two — all of that is normal and even desirable. The difference comes down to two criteria: duration and recovery. Normal fatigue fades with a little rest, good sleep, a day off. Overtraining, on the other hand, persists despite rest, and worsens if you push on.

Concretely: if after two or three days of rest you feel ready again, it was healthy fatigue. If, on the contrary, you stay drained, irritable, with no performance and no motivation after a full weekend's rest, the signal is different. A good habit is to track a few simple markers on waking: sleep quality, resting heart rate, mood and the desire to train. When several of these markers deteriorate at the same time and durably, it's no longer passing fatigue.

The deload protocol: how to recover

The good news is that overtraining can be corrected — provided you accept easing off, which is often the hardest part psychologically. The goal isn't a total, guilt-laden stop, but a structured deload that lets the body catch up on its recovery debt. Here's a simple, gradual approach.

This logic of measured progression ties into that of stabilisation, the phase we skip too often: progressing durably means accepting consolidation plateaus rather than chasing performance every session. Better to train a little less and progress without interruption than a lot and end up forced to stop.

The bottom line: less, but better

Overtraining is one of the most insidious traps of getting back into shape after 40, precisely because it disguises itself as quality. Wanting to do well, investing yourself, never quitting: these intentions are valuable, but without recovery they turn against you. The signs are there to warn you — declining performance, injuries piling up, disrupted sleep, irritability, motivation in free fall. Taken together and over time, they say one thing: your body needs to breathe.

The target isn't to always do more, but to do just enough to progress, and to recover enough to absorb it. Smart training alternates effort and rest the way breathing alternates in and out. Listen to the signals, plan your deloads, sleep seriously — and you'll transform your body over years, not over a few weeks followed by a hard stop.