Is strength training safe in children?
Contrary to a common worry, properly applied strength training is safe for children and young people and has many benefits. Leading sport-science bodies (for example the NSCA) state that, with qualified supervision and correct technique, children can do strength training and that this supports muscle-bone health, coordination, sporting performance and, most importantly, resistance to injury. There is no sound evidence supporting the belief that “strength training stops growth”; on the contrary, when applied correctly, the risk to the growth plates is low.
The key word here is “proper”. Children’s strength training is not a shrunk-down version of adult weightlifting; its aim is not to lift maximum weight but to learn movement correctly and to control the body.
When and how to start?
The general consensus is that when a child reaches the maturity to take part in sport (usually around 7–8 years), they are also ready for some form of strength work. What matters is not chronological age so much as the child being able to follow instructions and having basic balance and postural control. At the start, the focus is on fundamental movement patterns done with body weight: the squat, pushing (press-up progressions), pulling, the hip hinge and trunk stability.
The general recommendation is to work 2–3 days a week, on non-consecutive days, with a variety of exercises, 1–3 sets and a 6–15 rep range. Load is increased only when technique is flawless, and gradually. At the centre of each session is not “how many kilos” but “how correctly”.
Load management during the growth spurt
During the growth-spurt (circa-PHV) period the approach to strength training changes. In this period the bones lengthen faster than the muscles, coordination is temporarily disrupted, and the areas around the growth plates become more open to strain. So around the spurt the load is pulled back; the emphasis shifts to relearning movement quality, balance and trunk control with little or no load.
After the spurt has passed and maturation has progressed (post-PHV), strength development can safely be accelerated — especially in boys, with hormonal support. This gradual approach both protects safety and keeps development uninterrupted. Maximal/heavy lifts, meanwhile, are not appropriate until maturation is complete and technique is fully established.
Common mistakes
The most frequent mistakes in children’s strength training are: moving on to weight before teaching technique; applying adult programmes as they are; having children attempt maximal lifts; neglecting recovery and loading the same area every day; and allowing unsupervised work. All of these turn strength training from a useful tool into a risky practice.
Done correctly, however, strength training is a powerful foundation that supports the child’s performance in other sports and reduces injury risk. The best results come from a technique-first, gradual and enjoyable approach under qualified coach supervision. For a child, strength training should be designed not as a “mini adult programme” but as a developmental tool through which they get to know their body, learn correct movement and gain confidence.