The signs of overtraining in young athletes usually show up away from the legs first. Your child gets more colds in heavy weeks. Their numbers stop moving. They get stronger in the gym but no faster on the pitch. They just can't get up for it. The tight hamstrings and sore tendons, the things everyone looks at, come last.
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If you're a parent, here's the good news first: fatigue is normal. Everyone hits it. It isn't bad news. The problem is when nobody is reading it.
It stops being a muscle problem
One hard session, or one match, leaves your child with what I call session fatigue. That clears in about three days.
Stack weeks of hard sessions without full recovery and it becomes a different animal. The fatigue stops being in the muscle and becomes a regulation problem. Regulation means the systems that control the body, the nervous system and the stress hormones, stop doing their job properly.
In overtrained athletes, the stress system that should fire up for a second hard effort almost stops answering. Your child is asking the body for more and the body has stopped replying. See?
The signs of overtraining in young athletes, one by one
Here's what I look for, and what you can watch for at home.
They get sick in heavy blocks. The nervous system doesn't only drive the muscles. It runs the stress response, brain to the hormone glands. Keep the stress hormones up long enough and they start to suppress parts of the immune system. That's why kids in heavy training get more colds and infections. Treat it as information, not bad luck.
They're stronger but not faster. This one confuses parents the most. Your son has spent a year getting stronger and he's still not quicker. When you overtrain for pure strength, the nervous system shifts into overdrive. The muscles on both sides of a joint start firing at the same time and fighting each other, instead of one switching on while the other lets go. Don't get me wrong, I'm not anti-strength. I've squatted over 2.7 times my body weight. But strength needs to be planned around speed. More on this in does strength training make you faster.
The drive disappears. Their legs are fine and they just can't get up for it. That isn't attitude. Push hard enough for long enough and the brain turns the volume down on the signal to the muscles. The same chemical that turns you up, past a point, turns you down.
Decisions get late. A fraction late to read the pass, a fraction late to react, a fraction late to start the movement.
The numbers go flat. Their 10 m time or jump stops improving while they feel great. That gap is built-up fatigue.
Then the body complains. Tight hamstrings, a sore tendon, tight calves. By now the earlier signs have been there for a while.
Why young athletes get caught
A young athlete on a high-level pathway has a full football week before we even start: training, a game, extra sessions. Then someone adds extra running or extra gym on the day off because they want to help.
It comes from a good place. But we don't want to stack too much fatigue in the same 24 hours. And if your child has got more than two games in a week, the smart call is often rest from the programme. Programming is about being strategic, not always about the exercises.
How long it takes to come back
Here's the part almost nobody understands. Clearing built-up fatigue takes a long time, because you can't recover in the same state you train in. Under heavy load the stress hormones stay up and the body stays switched on, on the fight or flight side. As long as it's stuck there, it never fully gets into the calm recovery state where the heart rate settles and the deep sleep happens.
In our own testing across around 1,000 athletes, one flat out speed session takes 7 to 24 days to full neurological recovery, and after heavy build-up getting back to 100% freshness can run past 50 days. Those are our own figures, not a published study. And they are days to 100% neurological freshness, not days until your child can train. They can keep training. The question is what you're stacking on top.
What to do as a parent
- ✓Ask what they've done in the last 72 hours before deciding on any extra session. Count club, school and games, not just our sessions.
- ✓No gym the day before a game. Keep it fresh, then start again after.
- ✓Watch for the early signs, not just the sore legs: colds, flat mood, late decisions.
- ✓Don't add sessions on rest days without checking with the coach.
- ✓Look at the numbers, not the feeling. If your child is tested at the start of the first session each week, the same way every time, you'll see the gap.
The bigger picture
At Ambition every session is timed and reviewed on film. That's how we see overtraining before it becomes an injury or a lost season. We assess, find the things costing the most, fix them in order, and measure. If you want the full picture of how fatigue works, read signs of CNS fatigue in athletes.
More training isn't always more progress. Does that make sense?