Does lifting weights stunt growth in teenagers?

The fear of damaged growth plates has followed youth strength training for decades, but the research points consistently the other way. Malina reviewed 22 experimental training studies in pre- and early-pubertal children. The programs clearly improved strength without affecting height or weight development. Only ten of the studies monitored injuries systematically, and three injuries were reported in total, with injury rates between 0.05 and 0.18 per 100 participant-hours. The conclusion was that supervised training with weights and machines, at a low instructor-to-participant ratio, is relatively safe and does not negatively affect growth or maturation.

Two position stands reach the same conclusion. The NSCA's updated statement holds that resistance training can offer children and teenagers clear benefits when it is appropriately prescribed and supervised, and that qualified acceptance among medical, sport and educational organizations is approaching consensus. The 2014 International Consensus, written by leading paediatric exercise scientists and endorsed by bodies in paediatric medicine and sports medicine, repeats the message: strength training is safe and beneficial for young people when technique and supervision are in place.

The few serious injuries that appear in the literature are almost always tied to heavy maximal lifts without supervision or to poor technique, not to age itself. The load is not the problem. Missing supervision is.

The myth feels plausible because it rests on a simple wrong link: heavy load on a growing body sounds dangerous, and a growth plate sounds fragile. It is easier to picture a fractured plate than an injury that never happened. Isolated case reports of children hurt during unsupervised maximal lifts have been passed along as if they applied to all strength training, and a frightening story sticks better than a table of injury rates. The advice to wait has also felt safe to parents and coaches, because discouraging costs nothing visible while an injury does. No one profits directly from the myth, but the instinct for caution and the memorable horror stories keep it alive long after the data pointed elsewhere.

For a young person who wants to start lifting, the message is reassuring: go ahead. What decides safety is not age but setup. Start with bodyweight and light weights, learn the technique before adding load, and keep the lifts supervised by someone who knows the form. Hold off on heavy maximal attempts until the technique is solid. Set up that way, training builds stronger muscles, bones and tendons without getting in the way of growth.