It s something these kids have taken seriously. Warm-ups and stretching before each competition or practice increase the muscle temperature, making muscles more elastic and flexible. However, it is not always an idea that spreads to coaches of organized sports. Often, coaches are too rushed or players late to ensure a proper warm up. Therefore, it is up to the parents to make sure that their athlete has well-stretched muscles and is limber to be able to play well and to play safe.
Flexible muscles can decrease the risk of injury.
There are web sites that provide warm up exercises. I recommend that you print out your favorite exercises and hang a copy near the area where you store your sports equipment. Used under License.