Why We Shouldn't Treat Children Like Adults in Sport: Understanding Growth, Development and Injury Prevention

Children are not simply smaller versions of adults. Although this might seem obvious, sporting environments can sometimes treat young athletes as though their bodies, recovery needs and physical capabilities are the same as those of fully developed adults.

From football and rugby to gymnastics, athletics and competitive swimming, children are increasingly exposed to structured training, high workloads and pressure to perform. While sport offers enormous benefits for physical health, confidence and social development, it is important that training reflects a child's stage of growth and development.

Understanding the differences between children's and adult bodies is essential for improving performance, reducing injury risk and supporting lifelong participation in sport.

1. Children's bodies are still developing

One of the most important differences between children and adults is that the musculoskeletal system is continually changing throughout childhood and adolescence.

Bones grow in length through specialised areas of cartilage known as growth plates, or physes. These are found near the ends of many long bones and remain open until skeletal maturity.

Growth plates are biologically different from mature bone and can be vulnerable to repetitive loading and certain traumatic injuries. This does not mean children should avoid physical activity. In fact, appropriately prescribed exercise is beneficial for bone development. However, training needs to account for the changing capacity of developing tissues.

Tendons, muscles and bones also adapt to loading at different rates. During periods of rapid growth, changes in limb length, muscle strength and coordination can temporarily alter how a young athlete moves and tolerates training.

This is one reason why a child who previously managed a particular training programme comfortably may begin experiencing pain or difficulty as they enter a growth spurt.

What does this mean in practice?

Training should be adjusted to the individual rather than determined solely by age, sporting ability or the expectations of a coach.

A child experiencing a rapid growth phase may need temporary changes to training volume, exercise selection or recovery. Persistent pain should not automatically be dismissed as growing pains, particularly when it is localised, associated with activity or affecting sporting participation.

2. Growth plates and common sporting injuries

Children experience many of the same types of sporting injuries as adults, including muscle strains, ligament injuries and fractures. However, their developing skeleton creates some additional considerations.

Certain injuries are particularly relevant during childhood and adolescence.

Osgood-Schlatter disease

Osgood-Schlatter disease causes pain and tenderness around the tibial tuberosity, the bony prominence just below the kneecap. It is commonly associated with running, jumping and kicking sports during periods of growth.

Repeated traction from the patellar tendon can irritate the developing attachment site. Symptoms often increase with sport, kneeling or jumping.

Sever's disease

Sever's disease, also known as calcaneal apophysitis, is a common cause of heel pain in physically active children. It involves irritation of the developing growth region at the back of the heel and is often associated with running and jumping.

Apophyseal injuries

Apophyses are bony attachment sites for tendons. During growth, these areas can be vulnerable to repetitive traction and, occasionally, acute avulsion injuries, in which a fragment of bone is pulled away by a tendon.

These conditions are not necessarily caused by poor coaching or excessive training alone. Growth, biomechanics, sporting demands and individual susceptibility all play a role. However, appropriate load management can help reduce aggravation and support recovery.

3. Children do not recover in the same way as adults

It is tempting to assume that children need the same recovery strategies as adults, simply scaled down to their size. The reality is more nuanced.

Children and adolescents differ in their exercise physiology, hormonal environment, neuromuscular development and responses to particular training demands. Younger children may recover relatively quickly from some forms of exercise, particularly repeated high-intensity efforts, but this does not mean they can tolerate unlimited training or frequent competition.

Adolescents undergoing rapid growth may experience changes in coordination, strength and movement efficiency. In addition, the demands of school, sleep, social development and emotional wellbeing can all influence recovery.

The important point is that recovery requirements depend on the athlete, the type of exercise and the overall training load, rather than age alone.

Coaches and parents should consider the combined demands of training sessions, matches, tournaments, school sport and other physical activities. A child playing for several teams may be accumulating considerably more training than any individual coach realises.

4. Strength training is beneficial for children — when properly designed

One of the most persistent misconceptions in youth sport is that children should avoid strength training because it will damage their growth plates or stunt their growth.

Current evidence does not support this claim when resistance training is appropriately designed, supervised and progressed.

Well-structured strength training can improve muscular strength, motor skills, bone health and sporting performance. It can also form part of an injury-prevention programme by developing the physical capacities needed to tolerate running, jumping, landing and changes of direction.

However, children's strength programmes should not simply replicate adult bodybuilding or powerlifting routines.

Training should reflect the child's technical competence, experience, maturity and individual goals. Early sessions may focus on bodyweight exercises, balance, landing mechanics, movement control and learning how to use resistance safely.

As technique and confidence improve, external resistance can be introduced and progressively increased. There is no need to wait until a child reaches adulthood before introducing structured strength training.

Equally, there is no single age at which every child becomes ready for the same programme. Readiness depends on the individual, the quality of instruction and the ability to follow guidance.

5. Early specialisation: when more sport is not always better

Many parents understandably want to support their child's sporting ambitions. For talented young athletes, this can lead to increasingly intensive training, year-round competition and a focus on a single sport from an early age.

However, early specialisation is not necessary for success in every sport and may carry disadvantages, particularly when it involves high training volumes and little opportunity for recovery.

Repeatedly performing the same movements can increase exposure to repetitive loading. For example, a young tennis player may repeatedly stress the shoulder and elbow, while a young distance runner may accumulate substantial lower-limb loading.

Specialisation may be appropriate earlier in certain sports, but it should be balanced against the individual's physical development, motivation and health.

For many children, participation in a variety of sports and physical activities helps develop a broader range of movement skills, coordination and general athletic ability.

The aim should not be to prevent talented children from progressing. It should be to avoid assuming that more training, more competition and greater specialisation will always produce better long-term outcomes.

6. Growth spurts can temporarily change performance and injury risk

During adolescence, rapid changes in height, limb length and body proportions can influence sporting performance.

A young athlete may temporarily appear less coordinated, experience changes in running mechanics or struggle with movements that previously felt natural. These changes do not necessarily indicate a loss of talent or fitness.

Bones may lengthen faster than surrounding muscles and tendons adapt to the new dimensions. This can contribute to changes in flexibility, movement patterns and the distribution of forces across joints and tissues.

Some adolescents also experience periods in which strength and motor control do not develop at the same pace as height.

Coaches should therefore avoid interpreting every change in performance as a lack of effort or commitment. During periods of rapid growth, temporarily modifying training demands and placing greater emphasis on movement quality may be more appropriate than simply increasing the workload.

Importantly, growth itself does not inevitably cause injury. Rather, it is one of several factors that should be considered when assessing an athlete's changing tolerance to exercise.

7. Training should be based on biological maturity, not just chronological age

Two children of the same age can be at very different stages of physical development.

One 13-year-old may be approaching skeletal maturity, while another is entering a rapid growth phase. Their height, muscle mass, strength, coordination and capacity to tolerate particular training loads may differ considerably.

Chronological age remains useful for organising competitions and ensuring appropriate safeguarding, but it is an imperfect measure of physical readiness.

Biological maturity can influence how young athletes respond to training, particularly around puberty. However, estimating maturity is not always straightforward, and methods such as predicting peak height velocity have limitations.

In practice, coaches can monitor growth, training tolerance, symptoms and movement quality while recognising that physical maturity is only one part of an athlete's development. Psychological readiness, technical ability and the child's own experience also matter.

The goal is not to label children as early or late developers. It is to recognise individual differences and avoid applying identical expectations to athletes whose bodies are developing at different rates.

8. The psychological side of youth sport matters too

Treating children like adults is not limited to physical training. It can also involve expecting them to manage pressure, competition and disappointment with the emotional maturity of an adult athlete.

Children are still developing their ability to regulate emotions, manage stress and understand long-term consequences. Excessive pressure to win, fear of disappointing coaches or parents, and an environment in which injuries are viewed as weakness can undermine enjoyment and wellbeing.

A supportive sporting environment should encourage effort, learning and gradual improvement rather than judging a child's value solely by results.

Children should feel able to report pain, ask for rest and admit when they are struggling. If they believe that reporting an injury will lead to criticism or loss of selection, they may continue training when they need assessment.

Sport should help build confidence, resilience and social connection. These benefits are more likely to be sustained when a child's wellbeing is treated as equally important as their performance.

9. Practical advice for parents and coaches

Supporting young athletes does not require avoiding challenging training. It means ensuring that the challenge is appropriate and that the child has enough opportunity to recover.

Useful principles include:

• Prioritise movement skills. Develop coordination, balance, strength, landing technique and running mechanics alongside sport-specific skills.

• Progress training gradually. Avoid sudden, substantial increases in training volume or intensity, particularly after a period of reduced activity.

• Account for total workload. Consider all clubs, matches, school sport and independent training rather than looking at one session in isolation.

• Encourage adequate sleep and nutrition. Growing athletes need sufficient energy and nutrients to support both physical activity and normal development.

• Monitor growth and symptoms. Changes in coordination, persistent fatigue or recurring pain may indicate a need to review training.

• Allow recovery. Rest days and periods away from organised sport can be important for physical and psychological wellbeing.

• Take pain seriously. Persistent or focal pain, swelling, limping or pain that affects normal activity warrants appropriate clinical assessment.

• Keep sport enjoyable. Children's long-term participation is more important than maximising short-term performance at the expense of health.

10. When should a young athlete seek professional assessment?

Some post-exercise muscle soreness is normal, particularly when an athlete is learning new movements or increasing activity. However, persistent or worsening pain should not automatically be attributed to growth.

Clinical assessment is advisable when a child has recurring pain in the same location, focal tenderness over a bone or growth-related attachment site, swelling, a limp or symptoms that are interfering with everyday activities.

Acute injuries involving significant pain, deformity, an inability to bear weight or suspected fracture require prompt medical assessment.

A suitable rehabilitation programme can help a young athlete return to sport safely, but the diagnosis and management plan need to reflect the child's stage of development and the nature of the injury.

Conclusion: Develop the athlete, not just the performance

Children benefit enormously from sport. It supports physical fitness, bone health, coordination, confidence and social development. With appropriate coaching, progressive training and adequate recovery, young athletes can safely develop strength and sporting ability.

The problem arises when adult expectations are imposed on developing bodies and minds.

Growth plates, changing biomechanics, differences in biological maturity and the demands of adolescence all need to be considered when planning training. Equally, young athletes need an environment in which they can report pain, recover properly and enjoy participating without excessive pressure.

The objective of youth sport should be to develop healthy, capable and confident athletes who can continue participating for years to come — not simply to maximise performance today.

By recognising that children are developing individuals rather than miniature adults, parents, coaches and healthcare professionals can make better decisions that protect health while supporting sporting progress.