Strength training for kids and teenagers: is it safe?
Parents often ask whether their child is too young to lift weights, or whether it will stunt their growth. The concern is understandable, but it's based on an old myth. Properly supervised strength training is safe for young people and has real benefits.
Is strength training safe for children and teenagers?
Yes, when it's well designed and supervised. The 2014 International Consensus position statement on youth resistance training, endorsed by leading sports medicine, exercise science and paediatric organisations, supports resistance training for children and adolescents delivered by qualified professionals with a focus on technique (Lloyd et al., British Journal of Sports Medicine, 2014).
Does lifting weights stunt growth?
No. There's no evidence that appropriately supervised resistance training damages growth plates or reduces adult height. Growth plate injuries in young athletes are far more often linked with falls, collisions and overuse in sport than with supervised strength training.
What are the benefits?
Stronger muscles and bones, better movement skills, improved sports performance and confidence, and a lower risk of sports injuries. Across all ages, strength training reduced sports injuries to less than a third in a meta-analysis of trials (Lauersen et al., British Journal of Sports Medicine, 2014). Childhood and adolescence are also key years for building bone.
What age can kids start?
There's no set minimum age. If a child is ready for organised sport, usually around seven or eight, and can follow instructions, they can begin with simple body-weight and technique-based strength activities. Readiness to listen and learn matters more than age.
What should a young beginner do?
Start with body-weight movements: squats, lunges, push-ups, pulling exercises, planks, jumping and landing. Add light resistance, such as bands, medicine balls or light dumbbells, once technique is sound. Sessions should be short, varied and enjoyable.
When can teenagers lift heavier weights?
Once they've learned good technique over several months, teenagers can progress to heavier loads with barbells and machines under supervision. Progress should be gradual, with technique taking priority over the number on the bar.
How often should young people strength train?
Two or three sessions a week on non-consecutive days is plenty, alongside their sport and general play.
What are the real risks?
Most injuries in youth strength training come from poor supervision, poor technique, lifting too much too soon, or misusing equipment, particularly unsupervised at home. Maximal lifts and competitive ego lifting with friends are where problems occur.
Does my teenager need to lift to play sport?
It isn't compulsory, but it helps. A stronger young athlete tolerates training and competition better, and landing and cutting technique work reduces knee injury risk, especially in girls playing netball, soccer and football.
See our post on ACL injuries.
What about growth spurts?
During rapid growth, bones lengthen before muscles and tendons catch up, coordination can dip temporarily, and conditions such as Osgood-Schlatter and Sever's disease are common. Strength training can continue through growth spurts with some adjustment of loads and jumping volume.
See our posts on Osgood-Schlatter disease and Sever's disease.
How do I avoid my child doing too much overall?
Count strength sessions as part of total training load. A young athlete who plays several sports, trains most days and never has a rest day is at greater risk of overuse injuries than one who lifts sensibly twice a week. Make sure there's at least one full rest day and enough sleep.
See our post on early sport specialisation.
Should teenagers take protein powder or supplements?
Food comes first, and most teenagers can meet their needs through regular meals and snacks. Supplements such as creatine and pre-workouts aren't recommended for under-18s without medical or dietitian guidance.
Who should supervise?
A qualified coach, PE teacher, strength and conditioning coach or exercise professional with experience in young athletes. Check that the program emphasises technique and gradual progression.
Is it different for girls and boys?
The principles are the same. Girls benefit just as much from strength training, and it's particularly valuable through the teenage years for bone health and for reducing knee injury risk in jumping and cutting sports.
What if my teenager wants to train at a commercial gym?
Many gyms accept teenagers from around 14 to 16 with parental consent. An induction and a few sessions with a qualified trainer to learn technique make it much safer. Encourage a simple program and discourage copying advanced routines from social media.
Can a child with a sports injury still do strength training?
Usually, with modifications. Training the uninjured areas and gently strengthening around the injury is often part of recovery. Get the injury assessed first so the program can be adjusted.
How can an osteopath help?
We assess growing-related pain and sports injuries in children and teenagers, advise on what's safe to continue, and work with parents and coaches on training loads.
See our training hub. Book an assessment at our Berwick clinic. A 60-minute initial consultation is $149, with no referral needed and HICAPS on-site.
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Book an initial consultation at RISE Sports & Spinal in Berwick. Clear diagnosis, hands-on treatment, and a plan that actually gets you better.
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