Does lifting weights stunt growth? Does it make kids shorter?
No.
I’ve been asked this for decades — by parents, by coaches, by athletes who were told in a locker room that the bar would “stop them from growing.” It’s one of the most stubborn myths in sport. And it’s wrong.
When a young athlete trains under real supervision, with age-appropriate loading and clean technique, strength training does not slam the growth plates shut. It does not shrink them. What the research and the position stands keep saying — AAP, NSCA, ACSM, CSEP and others — is the same thing I’ve seen in the gym: done right, this work builds stronger bones, stronger tissue, and a more durable athlete.
What does get kids hurt is the opposite: unsupervised ego lifting, copying a pro’s Instagram program, maxing out before they can own a bodyweight squat, or stacking skills camps with no capacity underneath. That’s Load > Capacity. That’s how you get the injury epidemic — not from a coached goblet squat.
Where this myth came from
Three places. Let’s deal with them straight.
1. Growth plates
Growth plates are cartilage near the ends of long bones. Yes, they can be injured — usually from high-impact trauma in sport, not from a supervised strength session. Modern pediatric guidance has not shown well-designed youth resistance training to harm linear growth or physeal health when technique and load are right. Confusing a freak growth-plate fracture in a contact sport with a coached strength session is how the scare story stayed alive.
2. Hard labor is not the weight room
Extreme physical labor in unsafe conditions got tangled up with “lifting” in the public mind. A coached session with progressive loading is not a child on a factory floor. Stop blending those pictures.
3. Bad studies and bad headlines
Early papers mixed unsupervised chaos with proper coaching. Media ran with the fear. “Nothing sells like bad news.” Today the orgs that actually write the standards support supervised youth strength training when it’s taught properly.
If you’ve seen Mayo Clinic–style pages on kids and strength training, read the fine print: they’re talking about qualified supervision, technique first, sensible progression — not “never touch a weight.”
Is weight training safe for children?
Yes — when someone who knows what they’re doing is coaching the kid.
Not “yes, hand them a barbell and walk away.” Not “yes, let them copy the college program.” Supervision is the safety feature.
Organizations that back supervised youth strength training include:
- American Academy of Pediatrics
- American College of Sports Medicine
- American Orthopaedic Society for Sports Medicine
- National Strength and Conditioning Association
- Canadian Society for Exercise Physiology
- British Association of Sport and Exercise Sciences
- UK Strength and Conditioning Association
I’ve said this for years about ankles, knees, and Achilles: short range, slow, braced training mummifies tissue. The same logic applies here. You don’t protect kids by keeping them weak. You protect them by building capacity — under eyes that can cue a bad rep before it becomes a bad habit.
Compared with the contact sports many of these athletes already play — hockey, football, soccer — a well-run strength session is not the high-risk hour of their week. The high-risk pattern is more skills, more games, and no engine underneath. That’s the hamster-wheel problem. I wrote about that farm system in The Hamster Wheel.
Are the “dangerous for kids” numbers real?
When people say lifting is uniquely dangerous for children, look at comparative injury rates. These tables (from the safe-for-children article, based on the Hamill school survey often cited in the strength literature) put weightlifting and weight training next to other sports:
The point is not that sport is risk-free. The point is that supervised strength work does not deserve the special scare story it still gets.
Will lifting make my child shorter — or “too jacked”?
Shorter? No. Height is mostly genetics, nutrition, sleep, and overall health. Coached strength work is not a height tax.
Then why do some Olympic weightlifters look short? Because talent ID in that sport often selects athletes with leverages that help the lifts. Selection bias. Not proof the barbell shaved inches off them.
Too muscular / bulky? For most kids, no. Before and around early puberty, strength gains are largely neural — better recruitment, better coordination — not adult bodybuilding hypertrophy. We’re training athletes, not building show muscle.
What age can they start?
There’s no magic birthday stamped on a growth chart.
Practical standard I align with across the pediatric and S&C guidance:
- If a child is ready for organized sport (often around 7–8), they can usually start coached strength work.
- They need the maturity to take a cue and repeat a pattern.
- Early work is bodyweight and light external load, movement quality, consistency — not TRUE 1RM theatre by default.
A 10-year-old who can’t control a bodyweight squat isn’t “broken.” They need coaching. They don’t need a PR video.
How we train youth athletes 8–13 (AAS Kids)
- Bodyweight mastery first. Own the push-up, squat, hinge, lunge, and hang/row patterns before you chase heavy external load.
- No TRUE 1RM testing as a default for AAS Kids. Teach positions. Submaximal sets. Readiness for a real max isn’t about birthday age — it’s training age: how long that kid has been training properly. Some kids earn the right to 1RM pushes. Some of the best lifters in the world are 12, 13, and 14 years old hitting true 1RMs because they’ve been coached the right way since about 7 or 8.
- Technique over load. If the pattern breaks, the weight is too heavy. Drop it.
- Supervision is non-negotiable. Eyes on the bar. Equipment that fits the athlete.
- Progression is earned. Add load only after clean reps — and keep the sport calendar in view so the gym doesn’t bury them in fatigue.
Parents shopping facilities: ask the hard questions. Do you teach bodyweight patterns before heavy lifting? Do you throw true 1RM tests at kids who haven’t earned them? Who is watching the set? Those answers tell you more than a rack full of bumpers.
If you want the full athlete pathway — not a tip list — start with our athlete strength and conditioning program or online coaching for athletes. More reading lives under LPS education.
How much weight — and how often?
Load: Only go up when the reps stay clean. There is no universal “kids lift X pounds” chart that beats a coach’s eye.
Frequency: Most youth athletes do well on 2–3 quality sessions a week on non-consecutive days, especially in-season. More days only make sense inside a real plan that respects practices, games, sleep, and recovery. Volume without recovery is just another way to lose capacity.
Knees and warm-up work: When kneecap tracking is the limiter, simple tools like the Peterson step-up belong in a smart plan. They’re a tool — not the whole program.
What strength actually gives a young athlete
Supervised strength training can help kids and teens:
- Produce more force and power for their sport
- Build bone and connective tissue that can take progressive load
- Improve coordination, balance, and body awareness
- Balance out the one-sided patterns sport creates
- Build confidence from skills they can earn — clean reps, better control — not from hype
None of that requires copying a pro’s program. Pros have training age, recovery, and medical support most 12-year-olds don’t. Copy the wrong template and you’re borrowing someone else’s injury timeline.
FAQ
Does lifting weights stunt growth?
No. Supervised, age-appropriate resistance training has not been shown to stunt linear growth.
Does lifting weights make you shorter?
No. Same myth. Different wording.
Does lifting weights at 10, 11, or 12 stunt growth?
No. Age isn’t the danger. No eyes on the bar, bad technique, and ego loading are. Bodyweight-first programs are built for this age.
Does lifting weights before puberty stunt growth?
No. Prepubertal kids mostly get stronger through better neuromuscular control. Match the program to maturity — don’t drop an adult template on them.
Is weight training safe for children?
Yes, when a qualified adult coaches technique, fits the plan to the child, and progresses gradually. Unsupervised TRUE 1RM theatre is what you avoid.
Will lifting make my child bulky?
Almost never the way parents fear. We’re after athleticism and control, not bodybuilding.
How do I know a program is appropriate?
Supervision. Technique standards. Bodyweight competency before heavy loading. No random TRUE 1RM contests as a default. Readiness isn’t birthday age — it’s training age: how long that kid has been training properly. Some kids earn 1RM pushes. A plan that respects the sport calendar.
Sources
About the Author: Clance Laylor
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