Every Time a Teenager Walks Into a Gym…
…someone's parent is standing outside looking worried. "Don't let him lift heavy — it'll stunt his growth." Sound familiar?
This fear gets passed down through generations like a family recipe. Except this one has no real ingredients. Just anxiety, outdated beliefs, and a pretty fundamental misunderstanding of how the human body actually develops.
Mr. Ankush Kumar, fitness coach at DayZero and QuadFit, and Exercise Science Educator at The Quad Fitness Academy (TQFA), has spent years working with young athletes and adolescents. He's straightforward about it: "Parents come to me genuinely scared. They think if their child touches a barbell before 18, they'll stop growing. I understand the concern — but the science simply doesn't support it. In fact, avoiding strength training during adolescence might be doing more harm than good."
This one's for every parent who said no to their kid joining a gym. And for every teenager who's been told to wait. Let's break the myth down properly — and replace the fear with actual facts.
Where Did This Myth Even Come From?
To understand why this belief is so widespread, you have to trace it back to something real — growth plate damage.
Growth plates, also called epiphyseal plates, are areas of developing cartilage near the ends of long bones in children and teenagers. Because these plates are still forming during adolescence, they're theoretically more vulnerable to injury than the hardened bone of a fully grown adult.
Decades ago, some researchers and doctors noticed that severe growth plate injuries — caused by falls, accidents, or acute trauma — could occasionally disrupt normal bone development. That observation was legitimate. What happened next wasn't. Someone drew a much broader conclusion: that lifting weights in general causes this kind of damage, which then makes kids shorter.
The jump from "traumatic growth plate fracture can affect development" to "your kid doing squats at the gym will make him shorter" is enormous. And it has no scientific basis whatsoever.
What Does the Research Actually Say?
Let's be direct. There is no credible scientific evidence that properly supervised, age-appropriate strength training stunts height or damages growth plates in children or teenagers.
Here's what the research actually shows.
Growth plates are tougher than most people think
Growth plate injuries in gym settings are rare, and when they do happen, they're almost always the result of poor form, no supervision, or loads that were way too heavy for the athlete's level. The compressive forces from controlled resistance training are well within what developing bones can handle. Everyday activities like gymnastics, basketball, or even jumping rope expose growth plates to comparable — or greater — forces than moderate weight training does.
Resistance training actually builds stronger bones
Multiple peer-reviewed studies show that resistance training during adolescence increases bone mineral density. The mechanical load placed on bones during strength work stimulates osteoblasts — the cells responsible for bone formation. In plain terms: lifting weights makes bones stronger and denser, not shorter or weaker.
A long-term study published in the Journal of Bone and Mineral Research found that young athletes who did resistance training had significantly higher bone density than their sedentary peers — an advantage that often carried well into adulthood.
Height is mostly genetics
Your height is roughly 60–80% determined by your genes. The rest comes down to nutrition, sleep, hormonal health, and overall lifestyle. Resistance training, done correctly, doesn't interfere with any of these.
The hormones driving height during puberty are growth hormone and IGF-1. Here's the part most parents don't know: resistance training has actually been shown to stimulate growth hormone release, not suppress it. So in a real sense, the gym might be doing the opposite of what worried parents fear.
Growth Plates — A Closer Look
Growth plates sit at the ends of the femur, tibia, radius, ulna, and other long bones. During childhood and adolescence they're made up of rapidly dividing cartilage cells. As a person matures, these plates gradually harden into solid bone — a process that typically completes somewhere between ages 16 and 25, with girls generally finishing earlier than boys.
The worry is that heavy load on these cartilaginous areas could cause a fracture or deformity that disrupts normal bone lengthening. This kind of injury — called a Salter-Harris fracture — is a real medical concern. But it almost exclusively results from high-impact accidents, falls from height, or severe sports trauma. It is not associated with supervised resistance training.
The American Academy of Pediatrics, the National Strength and Conditioning Association, and the American College of Sports Medicine have all published position statements confirming the safety and benefits of youth resistance training when it's properly supervised and programmed.
What Experts Are Saying in 2026
The sports science community has been pushing back on this myth for years, and the evidence keeps stacking up on one side.
Mr. Ankush Kumar of DayZero, QuadFit, and TQFA says the real conversation parents should be having isn't whether their kids should strength train — it's how.
"Parents are genuinely scared about pushing their kids into weightlifting because they believe it will pause height development," he says. "But when I show them the research, when I explain how bones actually grow, the fear usually disappears. The bigger risk is doing nothing — kids who don't build foundational strength, movement quality, and body awareness during their developmental years miss a window that genuinely matters."
His approach at TQFA goes beyond teaching exercises. He teaches exercise science — the why behind movement, load, recovery, and adaptation. That educational piece, he argues, is what separates dangerous training from developmental training.
What About Gymnastics, Wrestling, and Combat Sports?
Here's where the double standard becomes impossible to ignore.
Young gymnasts perform explosive movements, absorb massive compressive and torsional forces through their joints and bones, and train intensively for hours daily — often starting as young as 4 or 5. Gymnastics is widely celebrated as a youth sport. Nobody's standing outside the gymnastics hall worried about growth plates.
Same goes for youth wrestling, martial arts, and competitive swimming — all of which place significant physical demands on developing bodies.
If physical loading during youth routinely damaged growth plates and stunted height, we'd expect to see widespread height problems among former gymnasts, wrestlers, and swimmers. We don't — because supervised, progressive physical loading within appropriate ranges simply doesn't cause that outcome.
The difference in how society treats "gym weights" versus "sport training" is cultural and emotional. It's not scientific.
When Can Kids Actually Start Lifting?
Most parents want a straight answer here, and the answer is probably earlier than you'd expect.
Children as young as 7–8 can safely begin structured resistance training according to guidelines from the NSCA and AAP — provided it's properly supervised and developmentally appropriate.
Here's a general framework that coaches like Ankush use.
Ages 6–10: Movement Mastery
Bodyweight movements only — squats, hinges, pushes, pulls. No external load necessary. The goal here is learning movement patterns, coordination, and basic body awareness. It's about moving well, not moving heavy.
Ages 10–13: Introduction to Light Load
Resistance bands, light dumbbells, medicine balls. Technique and consistency remain the focus, not intensity. Sets and reps should be moderate, rest periods generous, and it should genuinely be enjoyable. If a kid dreads it, something's wrong with the program.
Ages 13–16: Structured Resistance Training
Compound movements like goblet squats, Romanian deadlifts, bench press with moderate weight, and pull-up progressions are all appropriate here. Load should increase gradually and only when technique is solid. This age group responds extremely well to proper programming and tends to make fast progress.
Ages 16+: Progressive Overload Training
At this point, training can closely mirror adult programming. Barbell work, structured periodization, and higher training intensities are appropriate with proper coaching in place.
Throughout every stage, the principle is the same: technique and supervision first, load second. Always.
What Parents Should Actually Be Watching
If you're genuinely concerned about your child's growth and development, the gym is the wrong place to focus your worry. Here are the variables that actually matter.
Nutrition
Protein is essential for growth. Micronutrients like zinc, vitamin D, calcium, and magnesium are critical for bone development and hormonal regulation. Many adolescents — particularly those eating processed, convenience-heavy diets — are deficient in multiple key nutrients. This has real potential to affect growth. The gym does not.
Sleep
Growth hormone is released primarily during deep sleep, specifically during slow-wave sleep cycles. Teenagers sleeping less than 8 hours a night are genuinely compromising their hormonal environment for growth and recovery. Late screen time, irregular sleep schedules, and chronic sleep deprivation are legitimate concerns. A squat session three times a week is not.
Stress
Chronic psychological stress elevates cortisol. In excess, cortisol can suppress growth hormone production. Academic pressure, social anxiety, and family stress are far more physiologically relevant to growth outcomes than a properly conducted training session at the gym.
Medical factors
Conditions like hypothyroidism, growth hormone deficiency, and certain nutritional absorption disorders can all affect height. If a parent is genuinely worried about their child not growing as expected, a pediatric endocrinologist is the right call — not avoiding the gym.
The Real Risks of Keeping Kids Away From Strength Training
Let's turn this around entirely. What actually happens when you keep adolescents away from resistance training?
Higher injury risk in sport
Adolescents without foundational strength and movement quality are significantly more vulnerable to sports-related injuries — ACL tears, stress fractures, shoulder impingements. Resistance training is one of the most well-supported forms of injury prevention available. Keeping kids out of the gym doesn't protect their joints. It leaves them underprepared for the physical demands of the sports they're already playing.
Worse metabolic health
Muscle tissue is metabolically active. The more of it you carry, the better your insulin sensitivity, the healthier your body composition, and the more resilient your cardiovascular system. Sedentary teenagers are at elevated risk for metabolic syndrome, type 2 diabetes, and cardiovascular disease — conditions that are increasingly showing up earlier in life than they used to.
Mental health consequences
Exercise has profound, well-documented effects on mental health. It reduces symptoms of anxiety and depression, improves self-esteem, enhances body image, and gives teenagers a healthy outlet for stress. Keeping young people away from structured physical activity — because of a myth — potentially removes one of the most effective mental health tools they have access to.
A missed developmental window
Adolescence is arguably the best time in a person's life to build foundational strength, bone density, and neuromuscular coordination. The adaptations made during this period have lasting effects on athletic performance and physical health throughout adulthood. Missing this window has real, long-term consequences that don't just disappear once someone turns 18 and is "allowed" to train.
How to Find Good Youth Strength Coaching
Part of why these myths persist is that poorly supervised gym environments genuinely do cause injuries — not because of weights, but because of negligence. When you're evaluating a strength program for a young person, here's what to look for.
Qualified coaching matters. Look for coaches with credentials in exercise science, strength and conditioning, or youth fitness. Educators at institutions like TQFA who ground their coaching in science rather than trends represent the standard young athletes deserve.
A relentless emphasis on technique. A good youth program prioritises movement quality above everything else. Load comes after mechanics are solid, not before.
Progressive and individualised programming. Cookie-cutter programs don't account for individual maturity, movement competency, or training history. Good programming builds logically and is adjusted for the individual athlete.
A positive environment. Young people thrive when effort is celebrated, mistakes are treated as learning opportunities, and the culture is inclusive. If a kid feels judged or pressured, that's a coaching problem.
Open communication with parents. Great coaches educate parents and welcome their questions. An informed parent is an ally. The best youth coaching environments treat family involvement as a feature, not an obstacle.
Myth Busted. Science Confirmed.
Here's the summary, clearly.
The myth: lifting weights stunts height in children and teenagers.
The reality: there is no scientific evidence supporting this. Properly supervised, age-appropriate resistance training does not damage growth plates, does not suppress growth hormones, and does not interfere with height development. What it does do is increase bone density, support hormonal health, reduce injury risk, and improve mental wellbeing in young people.
Height is primarily determined by genetics. After that, nutrition, sleep quality, stress management, and hormonal health are the relevant variables. None of these are negatively impacted by smart, well-coached strength training.
As Ankush Kumar puts it: "We're at a point in 2026 where we have more than enough research to retire this myth for good. The question shouldn't be 'should my child lift weights?' — it should be 'how do we make sure they're doing it right?'"
Final Thought: Educate Before You Eliminate
Fear around our children's health is completely understandable. Every parent wants to protect their kid. But fear built on misinformation doesn't protect anyone — it just deprives.
When parents actually understand how bones grow, how growth plates work, what genuinely influences height, and what resistance training does to a developing body — the fear tends to go away on its own, replaced by something more useful: confidence, support, and involvement.
The gym, with proper guidance, isn't a threat to your child's growth. It's an investment in it.
So next time someone tells you that lifting weights will make your kid shorter — you'll know exactly where the science stands. And you'll know exactly what to say.
Want to learn more about youth strength development or get your child into a properly coached program? Connect with Mr. Ankush Kumar at DayZero, QuadFit, or The Quad Fitness Academy (TQFA) — evidence-based coaching built around developing young athletes the right way.