A warm-up can involve light calisthenics or a short jog. This helps raise the core body temperature and prepares all the body's muscles for physical activity. Pain is a warning sign of injury. Ignoring it can lead to greater injury. They may mean the child has a more serious injury than initially suspected.
Rest is by far the most powerful therapy in youth sports injuries.
Nothing helps an injury heal faster than rest. Children who play on more than one team are especially at risk for overuse injuries. Overuse injuries are caused by repetitive stress put on the same part of the body over and over again. Injuries that look like sprains in adults can be fractures in children. Children are more susceptible to fractures, because their bones are still growing.