This has been proven in soccer, football and hockey. However, goal setting, good coaching and supervision are keys to success. Young athletes need to learn how to lift properly. This is a motor skill as with any other sport.
Technique is critical.
Athletes must be supervised in their training. Training until there is fatigue is not a desired goal. The more fatigued the athlete becomes in training, the longer the required recovery period. Overtraining can cause reduced sports performance, insomnia, fatigue, loss of appetite, irritability and a loss of desire to train. The training of an athlete requires the selection of exercises that allow the body to be trained as a whole or as one unit.