Does Lifting Weights Stunt Growth?
No. There's no evidence that lifting weights stunts growth. A review of 22 resistance training studies in children and young teens found training didn't affect their growth in height or weight, and injuries were rare when programs were supervised. Major sports medicine organizations now support strength training for young people, with proper coaching.
The myth is old and persistent, and it scares a lot of parents and young lifters away from the gym. Here's where it comes from, what the research actually shows, and what separates safe youth training from the kind that really can cause injuries.
Where Does the Idea That Lifting Stunts Growth Come From?
From worries about growth plates. Children and teens have areas of developing cartilage near the ends of their long bones, where growth happens. The fear was that heavy loads could damage them and stop a bone from growing. It sounded logical, but controlled research hasn't found that supervised strength training does this.
The studies that tested the question directly used structured, supervised programs with sensible progression. That's an important distinction from teens lifting alone with poor technique or loads they can't control, which is a different risk altogether.
The National Strength and Conditioning Association's youth resistance training position statement notes that resistance training can offer unique benefits for children and adolescents when it's appropriately prescribed and supervised, and that acceptance by medical, fitness and sport organizations is becoming universal.
What Does the Research Show?
That supervised lifting doesn't harm growth. An evidence review of 22 training studies in children and early teens found significant strength gains, no effect on growth in height or weight, and very few injuries. Programs typically ran two or three days a week for 8 to 12 weeks, using machines and free weights.
That 2006 evidence-based review in the Clinical Journal of Sport Medicine concluded that supervised programs with low coach-to-athlete ratios "are relatively safe and do not negatively impact growth and maturation." Only 10 of the studies systematically tracked injuries, and between them they reported just three.
| Finding from the 22 studies | Result |
|---|---|
| Strength | Significant improvements |
| Growth in height and weight | No effect |
| Injuries (in the 10 studies that tracked them) | 3 in total |
| Injury rates reported | 0.05 to 0.18 per 100 hours of training |
Those injury rates mean, at most, about one injury for every 570 hours of training. The review also noted that the strength gains faded when the young people stopped training, just as they do in adults.
Is Lifting Safe for Teenagers?
Yes, with good coaching and sensible loads. The key safety factors are supervision, learning proper technique before adding weight, and progressing gradually. A 2014 international consensus statement on youth resistance training was endorsed by leading sports medicine, exercise science and pediatric organizations.
That 2014 International Consensus position statement, published in the British Journal of Sports Medicine, was adapted from the UK Strength and Conditioning Association's guidance and reviewed by experts in pediatric medicine and sports science. Its existence reflects how far opinion has shifted, from warning young people away from weights to helping them train well.
The World Health Organization's 2020 guidelines go further, recommending muscle-strengthening activity for all age groups, alongside an average of 60 minutes a day of moderate-to-vigorous activity for children and teens.
What Actually Causes Injuries in Young Lifters?
Mostly poor technique, too much weight too soon, and lack of supervision. Teens who train alone and chase maximum lifts before learning form are at higher risk than those in coached programs. Horseplay around equipment and dropped weights also account for injuries that have nothing to do with growth.
A sensible approach for a young lifter:
- Learn the movements first. Master squats, hinges, presses and rows with light weight or bodyweight.
- Get coached. A qualified coach or experienced adult watching sets makes a big difference.
- Progress gradually. Add weight in small steps only when form stays solid.
- Skip true max lifts early on. Moderate weights for higher reps build strength safely.
- Recover. Sleep and rest days matter even more for growing bodies; our guide on how many rest days a week you need covers this.
If something hurts in a joint rather than in the muscle, stop that exercise and have it checked rather than training through the pain.
Can Lifting Weights Help Teens?
Yes. Beyond getting stronger, structured strength training can improve sports performance and is recommended by health organizations as part of normal physical activity. Starting young, with good habits, also gives teens a base of technique they'll use for the rest of their lives.
The 2006 review found significant strength improvements across childhood and early adolescence, and the WHO now counts muscle-strengthening as a recommended activity for children and teens. The NSCA statement also points out that regular physical activity is essential for normal growth and development in the first place, and that an active childhood may help reduce the risk of some chronic diseases later in life. For young athletes, getting stronger is often one of the most useful things they can do for their sport.
If a young lifter is also curious about supplements and caffeine, the advice is different. Our guide on whether coffee stunts your growth covers caffeine limits for teens, which are lower than for adults.
How Heavy Should a Teenager Lift?
Heavy enough to be challenging with perfect form, but not near their absolute maximum at first. A common starting point is moderate weights for sets of about 8 to 15 reps while technique develops. As skill and strength improve under coaching, heavier loads can be introduced gradually.
The studies in the 2006 review used a range of loads with supervision, and the injury rates stayed low. The common thread wasn't avoiding weight altogether; it was controlled progression and someone watching.
Signs to back off include pain in a joint (rather than normal muscle soreness), form breaking down on every rep, or lifting through fatigue to hit a number. Our guide on whether you should work out while sore explains the difference between normal soreness and warning signs.
FAQ
At what age can you start lifting weights?
Research programs have included children before puberty, and organizations support supervised strength training for kids and teens. The right starting age depends more on maturity, the ability to follow coaching and the quality of supervision than on a specific birthday.
Does lifting weights make you shorter?
No. In the evidence review of 22 youth training studies, resistance training didn't change how tall the young participants grew. There's no evidence that a supervised strength program makes anyone shorter, whether they start as a child or a teenager.
Can lifting damage growth plates?
Injuries are possible in any sport, and accidents or very poor technique raise the risk in the weight room too. Supervised resistance training programs reported very few injuries, and the evidence review found no effect on growth. Coaching and gradual progression are the main protection.
Should teenagers take creatine?
That's a separate question from lifting. Creatine research in teens is more limited than in adults, so it's a decision to make with a parent and doctor; is creatine safe for teenagers covers what's known. Good training, food and sleep matter far more for a young lifter's progress than any supplement.
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