Physiologically, Children and Adults differ primarily in their power, speed/agility and strength.
In children their bones are softer than adults, thus their bodies are more flexible than adults.
In children their heart rates are generally higher than in adults.
Muscles are more developed in adults
Due to well developed muscles, adults have more strength than children.
The joins and ligaments in children are softer, hence can undertake more stress and strain. IN adults they get rigid overtime and hence less flexible. For example, in a child a dislocated arm can be fixed more easily than in an adult. Also a child can suffer from dislocation more frequently than an adult.
In children their bones are softer than adults, thus their bodies are more flexible than adults.
In children their heart rates are generally higher than in adults.
Muscles are more developed in adults
Due to well developed muscles, adults have more strength than children.
The joins and ligaments in children are softer, hence can undertake more stress and strain. IN adults they get rigid overtime and hence less flexible. For example, in a child a dislocated arm can be fixed more easily than in an adult. Also a child can suffer from dislocation more frequently than an adult.