How much exercise does a child actually need?
The Centers for Disease Control and Prevention recommends that children and adolescents aged 6–17 get 60 minutes or more of moderate-to-vigorous physical activity every day, including muscle-strengthening and bone-strengthening activity on at least three days a week. The World Health Organization publishes broadly the same guidance.
Two details get lost. The first is that it is 60 minutes every day, not per week. The second is that three of those days need to include strengthening work — and that is the part most children miss completely.
The three components, and what usually covers them
- Aerobic — running, cycling, swimming, most active play. The bit families usually do cover.
- Muscle-strengthening — climbing, push-ups, gymnastics, resistance work, martial arts. Commonly missed.
- Bone-strengthening — jumping, running, impact activity. Matters most in childhood, when bone is being laid down.
What counts toward the 60 minutes?
More than parents assume. It does not need to be organised sport, it does not need to be continuous, and it does not need supervision. Anything that raises heart rate and breathing counts, and it accumulates across the day.
- Walking or cycling to school
- Break time and playground running
- PE lessons
- An after-school activity or class
- Active play in the garden or park
- Chores that involve real movement
What does not count is the hour they spent sitting on the sidelines waiting for a turn — which is worth remembering when you are assessing whether an activity is really delivering what it appears to.
Why strength training matters for children
There is a persistent myth that strength work stunts children's growth. Major paediatric and sports-medicine bodies have long held the opposite: appropriately supervised strengthening activity is safe and beneficial for children, and it is explicitly part of the CDC guidance.
For children this rarely means weights. It means body-weight work — climbing, hanging, jumping, push-ups, resistance against their own mass. Martial arts is built almost entirely from this kind of loading, which is why it fills the gap that running-based sports leave open.
What if my child hates sport?
This is the question that actually brings parents to this page, so here is a real answer. A child who 'hates sport' usually does not hate movement — they hate one or more of these specific things:
- Being watched while bad at something. Team sport makes every mistake public and consequential.
- Being compared. A scoreboard and a squad rank them continuously.
- Letting people down. For an anxious child this is the heaviest part of team sport by a distance.
- Not playing. Sitting on the bench is boring, and it is also a message.
Every one of those is a feature of competitive team sport, not of exercise. Remove them and a lot of sport-hating children turn out to be perfectly willing to move. Individual, non-selective activities — martial arts, swimming, climbing, dance, cycling — remove all four at once.
The child who hates sport and the child who hates exercise are usually two different children. Most of the time you have the first one.What we see on the floor
How does martial arts fit into this?
It covers all three components in a single class — cardio through drilling and pad work, muscle-strengthening through body-weight technique and holding positions, bone-strengthening through jumping and impact. It also trains balance and coordination, which the guidance does not require but which children benefit from enormously.
The practical advantage is different, though, and it is worth being direct about: it is an activity children keep doing. The best exercise for a child is the one they will still be doing in two years, and that consideration outranks almost every physiological argument on this page.
| Component | Covered in a martial arts class? | How |
|---|---|---|
| Aerobic | Yes | Drilling, pad work, sparring, warm-ups |
| Muscle-strengthening | Yes | Body-weight technique, stance holding, push-ups, kicking against resistance |
| Bone-strengthening | Yes | Jumping, impact work, footwork |
| Balance & coordination | Yes | Single-leg technique, stance transitions, partner drills |
| Flexibility | Yes | Structured stretching every class |
Two classes a week does not on its own reach 60 minutes a day — nothing organised does. It covers the strengthening requirement and anchors the habit.
Try a class and watch them move
Free, one hour, no commitment. Bring a t-shirt and shorts.
How do I build the habit without a fight?
- Pick something they choose. Enthusiasm outperforms optimal programming every time.
- Make it routine, not a decision. Tuesday is training. Nobody negotiates Tuesday.
- Go with them. Active parents produce active children more reliably than any amount of encouragement.
- Judge effort, not outcome. Praise turning up on the day they did not want to. That is the actual skill.
- Give it three months. Almost everything is unpleasant during the incompetent phase.
What about screen time?
The useful framing is not 'less screen time' — which is a subtraction a child has no reason to want — but a competing activity they actively look forward to. Displacement works where prohibition does not.
An activity outside the house, with their friends in it and a visible sense of getting better at something, competes with a screen. A rule on its own does not.