Most people will tell you that it is important for your children to be enrolled in sports. There are a multitude of reasons why this is beneficial and I personally played hockey, curling, and basketball when I was in grades 7 to 12.
Kids need to have something to do with their time or else they will find something to do that may not be good. They just get bored and start doing stupid things like starting to drink or smoke at an early age. If they and their other unmotivated friends are just sitting around, they are bound to get into something you don’t like. So, why not be proactive and keep them so busy that they don’t have time to hang around, or they are too tired to get bored. This really helps with instilling discipline and goals into them and it will help with their school work as well.
Here is a good video that expands on this.