The evidence in brief
If your teenager wants to start strength training, the main professional bodies are broadly reassuring. The American Academy of Pediatrics (AAP) concludes in its 2020 clinical report that resistance training is safe and beneficial for children and adolescents when it is properly designed and supervised. The federal physical activity guidelines, summarised by the CDC, include muscle-strengthening activity on at least three days a week for everyone aged 6 to 17, and note that adolescents may start structured weightlifting programmes, often alongside sport.
The conditions in that conclusion are the part that needs a parent's attention: qualified supervision, good technique, a gradual build-up, and no maximal lifts before growth has finished. The six guides on this site explain each of these in more detail, written so that teens can read them too. This page is about the parts where adults can help most.
Choosing a setting
The AAP's parent page links the more serious strength training injuries to unsupervised training, and describes a well-supervised setting as one with an instructor with a proper certification and a small group of young people per instructor. It also points out that certifications vary widely, from an open-book test to a degree with practical exams and continuing education, so a qualification on its own does not tell you much.
Good options are often close to hand: school teams and physical education programmes, community centres, and youth sports clubs where strength work is part of training. A setting is not right just because it is convenient or because friends use it. Watching a session before your teen joins is a reasonable request.
Questions to ask
These questions are drawn from what the AAP and other sources describe as safe practice. They are a starting point, not a checklist that guarantees safety.
- Who supervises the sessions, what qualification do they hold, and how many young people does each supervisor watch at once?
- How are new movements taught? The AAP advises practising each lift without weight until technique is right.
- Is equipment adjusted for each teen's size, and is there spotting for free weights?
- Does every session start with a warm-up and end with a cool-down?
- What happens if a teen reports pain? The AAP's advice is to stop lifting at once.
- Does the programme avoid maximal lifts for teens who are still growing?
- Does anyone there recommend or sell supplements to young people? If so, that runs against the AAP's position.
Worked example (illustrative only)
An invented example. A parent's 13-year-old asks to join friends at a gym. The parent asks to watch a youth session first and sees one instructor working closely with a small group, teaching movements with a broomstick before any weights. They also notice that nobody is offered products or diet advice. They agree to a trial month and check in with their teen after each week. This describes no real family or gym.
Equipment at home
Body-weight exercises at home need little equipment and carry little equipment risk. Weights at home are different: the AAP notes that the rare serious accidents in youth strength training include weights falling on a young person, a risk that rises without a trained spotter. If a home bench or barbell is on the wish list, it is worth waiting until your teen has learned the movements under qualified supervision, and agreeing that weights are only used with a capable adult present.
Talking about supplements
The AAP opposes the use of performance-enhancing substances by children and adolescents, including products sold to improve performance or change appearance. The FDA explains that it does not approve dietary supplements for safety or effectiveness before they are sold. The U.S. Anti-Doping Agency (USADA) adds that some products labelled as supplements, including bodybuilding products, have been found to contain anabolic steroids or other hormones.
MedlinePlus lists stunted growth in teens among the health effects of anabolic steroid misuse, alongside heart, liver, hormonal and mood effects, and notes that using them without a prescription is not legal or safe. The guide on supplements and steroids sets this out in full and is written for teens to read.
Teens are likely to see advertising for muscle products, often online. A calm, curious conversation tends to go further than a ban: what have they seen, what does it promise, who is selling it, and what do the FDA and the AAP say? If your teen has already used something, the FDA and MedlinePlus both advise telling a health care provider about any supplement, and a doctor can advise on the specific situation.
Health, not appearance
Many teens start training partly because of how they want to look. That is understandable, and it is also worth steering. The National Institute of Mental Health (NIMH) notes that becoming fixated on weight, body shape or controlling food intake may be a sign of an eating disorder. MedlinePlus explains that eating disorders are serious but treatable medical conditions, that they frequently appear in the teen years, and that excessive exercise and fasting are among their symptoms. MedlinePlus also notes that anyone can develop one.
Things that help, drawn from the spirit of these sources rather than any single rule:
- Talk about what training lets your teen do, such as getting stronger, playing better and feeling good, rather than how it makes them look.
- Avoid comments about weight or body shape, including your own.
- Make sure training sits alongside regular family meals, not instead of them.
- Notice if exercise starts to look compulsory: training through illness or injury, distress at missing a session, or eating that becomes rigid or secretive. NIMH stresses that early treatment matters, so a conversation with your teen's doctor is the right step.
MedlinePlus also notes that parents can set an example by being active themselves. Exercising together, in whatever form suits the family, keeps the focus on health and enjoyment.
Sleep and schedules
The AAP supports the American Academy of Sleep Medicine's guidance that teens need 8 to 10 hours of sleep a day, and points out that teens need more sleep, not less. Their body clocks shift later around puberty, while early school starts cut the night short. The AAP encourages families to make sleep a household priority, keep screens out of bedrooms at night, turn them off an hour before bed, and avoid overscheduling evenings.
For a teen who trains, sport, homework and a social life all compete for the same evening hours. Helping them protect sleep is one of the most useful things a parent can do for both training and school. The guide on food and sleep has more detail.
When to involve a doctor
A check-up before starting a new sport is a good time to mention strength training. MedlinePlus lists getting a physical among the first steps for safe sport. The AAP advises that teens with certain conditions, including uncontrolled high blood pressure, seizure disorders, a history of childhood cancer treated with chemotherapy, or complex congenital heart disease, need medical advice or specialist approval before strength training.
After that, the main reasons to involve a doctor are pain that does not settle or that changes how your teen moves, any significant injury, any suspected head injury, regular sleep problems, worrying changes in eating or exercise, and any use of supplements or other substances. The guide on when to see a doctor sets these out, along with when to call emergency services.
Read next: When to see a doctor