Successful athletes are all trained since childhood , but athletes should not push hard since childhood. There are some reasons. Firstly, If you push hard When a child can not do it, Child athletes will be stress. Children should be relaxed sure about ready to receive training. Secondly, child athletes can be injured. For example, some dangerous sports if child athletes get hurt they may stop growing or may not play at all. I think it does not deserve it. Finally, children have no idea as their own due to pushing child athletes hard. Because children are teens that physical development and motion, it also develops the idea. Thus, child athletes should not push hard because successful athletes are not involved in just a push hard.