Junior Athlete Training: What Science Says About Strength Training for Teens

One of the most persistent myths in sport and fitness is that teenagers should not lift weights — that resistance training will stunt growth, damage developing bones, or cause injury. This belief is not supported by the scientific evidence. In fact, the evidence points in exactly the opposite direction.

Supervised, age-appropriate strength training is one of the most beneficial things a developing athlete can do. It builds stronger bones, reduces injury risk, improves movement quality, and creates the physical foundation for long-term athletic development.

WHAT THE RESEARCH ACTUALLY SAYS

A comprehensive review of youth resistance training research published in the British Journal of Sports Medicine found that properly supervised strength training in adolescents produces significant improvements in strength, power, and body composition — with injury rates lower than many traditional youth sports.

The key phrase is properly supervised. Unsupervised or inappropriately loaded training in teenagers can cause injury — but so can unsupervised running, unsupervised contact sport, and any physical activity without qualified instruction.

AGE-APPROPRIATE TRAINING PRINCIPLES FOR TEENS

Ages 12–14 — Focus on movement quality and body weight mastery. Learning to squat, hinge, push, and pull correctly. Load is minimal. The goal is building the neural patterns that underpin all future strength development.

Ages 14–16 — Progressive loading introduced. Barbell and dumbbell exercises with technique focus. Conditioning work introduced for sport-specific development.

Ages 16–18 — Full strength and power development. Periodised programs aligned with the athlete's sport season and competition schedule.

WHAT ACE PERFORMANCE'S JUNIOR PROGRAMS INCLUDE

ACE Performance runs structured junior athlete programs at Fairfield, Mt Waverley, and Oakleigh for athletes aged 12–18. Programs are designed by sports scientists and exercise physiologists with experience in youth athletic development. Every junior athlete is assessed before starting a program, and programming is adjusted based on their training age, sport demands, and developmental stage.

If your young athlete is serious about sport and wants to train in a structured environment designed for athletes — not adults — enquire about ACE junior programs today.