To be good and competent, which is to fight. Children's bodies are not strong enough to get the training that size. Children's bones are not strong enough. Make the kids get hurt and can affect the body in different parts.
To be competent and have expertise Which has the same punch. A child's body is not strong enough to get the training for it. Children's bones are not strong enough. The child was injured And affect different parts of the body.
Be good and expertise, which is fought. The body of a child is not strong enough to take the training size. The bones of children still not strong enough. The child received injuries. And affect the body in various parts.