Does Lifting Weights Stunt Growth? A Parent's Guide

Does lifting weights stunt growth? In well-designed, supervised youth resistance-training studies, researchers have not found impaired height growth. The American Academy of Pediatrics (AAP) says appropriately designed programmes have no apparent negative effect on linear growth or growth-plate health. That is a finding about the programmes studied, not a guarantee about every gym session or child. [1, 2]

A parent asking this question usually needs two answers: what the evidence says about height, and what would make a first training experience appropriate for their child or teen. The second answer depends on the young person's interest, a qualified instructor, the task being taught, and the rest of their activity. It does not begin with a universal bar weight or a competition goal.

Does lifting weights stunt growth? What the evidence can say

Malina's evidence review examined 22 reports on pre- and early-pubertal resistance-training programmes. The experimental programmes did not affect growth in height or weight, and they improved measured strength. Only ten reports systematically monitored injuries, so the review's safety conclusion is bounded by that incomplete monitoring and by the supervised settings studied. [2]

The AAP's 2020 clinical report, reaffirmed in 2024, likewise says well-designed resistance training has not been shown to harm linear growth or growth plates. It also treats supervision, technique, and a suitable training environment as central to safety. Its evidence does not justify saying growth plates cannot be injured. [1]

“Resistance training” is wider than a heavy barbell. It includes learning to move against body weight, bands, machines and free weights. The question is whether the chosen task matches the young person's current skill and is taught and watched well. A barbell can be a tool within that process; owning a barbell does not itself make a youth session appropriate. [1, 3]

What changes the training decision

A young person should have a reason to be there and a chance to learn. A good first session can be about following directions, finding a controlled movement, and receiving useful feedback. It need not be a test of how much weight they can lift. The AAP and NSCA both emphasize developmentally appropriate instruction and qualified supervision. [1, 3]

The training environment matters too. The instructor should be able to see the lift, explain the task in language the young person understands, and adapt it when the task is not yet repeatable. A youth programme also sits alongside school, sport, play and recovery; more work is not automatically better. Those are practical questions for the parent and instructor, not a formula that can be inferred from age alone. [1, 3]

This is an editorial conversation guide, not a screening test or a training prescription. A parent, young lifter and qualified instructor can use it to decide what to ask next.

1. 1. Interest

   Does the young person want to learn?

   Start with a conversation about their goal and an enjoyable movement session.

2. 2. Instruction

   Can a qualified adult teach and watch the movement?

   Practise a manageable version of the movement and use feedback before adding load.

3. 3. Repeatability

   Can they follow directions and repeat the chosen technique?

   Progress the task only when the current version remains controlled and engaging.

4. 4. Review

   Is the activity still suitable within the rest of their sport and life?

   Revisit the plan with the young person and supervisor; individual health questions go to a clinician.

If a child has a known health condition, a history of injury, or symptoms that concern the family, ask an appropriately qualified clinician about participation. The AAP identifies specific health situations that require medical consultation. A coaching article cannot clear an individual for training or interpret symptoms. [1]

Learning a lift is different from chasing a total

Strength practice, a one-repetition maximum test, and powerlifting competition have different purposes. A young lifter may learn a squat, press or pull with a task they can control, then build skill through repeated feedback. The IPF rulebook, by contrast, governs judged squat, bench press and deadlift attempts in a competition. Its technical rules are useful for understanding the sport, not a starting prescription for children. [4]

The AAP notes that maximum-strength testing can be conducted under appropriate supervision and protocols; that does not mean every beginner needs it. A parent can ask what a proposed maximum or meet would add to the child's current goal, who would supervise it, and whether the child wants that experience. If the answer is unclear, there is no need to turn the first training block into a test. [1]

Our squat technique guide explains how feedback on a lift can be more useful than simply adding load. The guide to ongoing technique coaching applies the same idea beyond the first lesson. For families considering local instruction, the coaching chooser explains the available ways to speak with Minimum Strength. None of these pages replaces individual medical advice.

A first conversation to have with the instructor

Ask: What does the young person want from training? Who will teach and supervise each session? What movement will they learn first, and how will the instructor know it is repeatable? How does the session fit with their other sport and school activity? What would prompt a change of plan or a clinical referral?

Those questions give a child or teen a better start than “How old before they can lift heavy?” They keep the decision tied to the person in front of the coach and make room for strength training to be a skill they enjoy learning.

Sources

1. Stricker, Faigenbaum and McCambridge. Resistance Training for Children and Adolescents. DOI: 10.1542/peds.2020-1011 (clinical report, reaffirmed November 2024) — American Academy of Pediatrics, Pediatrics 145(6), 2020; Key Points, Skeletal Risks and Recommendations (verified 2026-10-11)
2. Malina. Weight training in youth—growth, maturation, and safety. DOI: 10.1097/01.jsm.0000248843.31874.be (evidence review) — Clinical Journal of Sport Medicine 16(6), 2006, 478–487; abstract Methods, Results and Conclusion (verified 2026-10-11)
3. Faigenbaum and colleagues. Youth resistance training: updated position statement. DOI: 10.1519/JSC.0b013e31819df407 — National Strength and Conditioning Association, Journal of Strength and Conditioning Research 23(5 Suppl), 2009 (verified 2026-10-11)
4. International Powerlifting Federation Technical Rulebook, version 3, effective 1 March 2026 — International Powerlifting Federation, Technical Rules (verified 2026-10-11)