The Center for Disease Control recommends that young children get exercise through age appropriate activities such as playgrounds and dance classes. Unsurprisingly, many public schools and other youth organizations offer things like after school programs for kids, art classes for children, and many other activities. In short, the benefits of after school programs cannot be understated, as more times than not they keep children busy, healthy, active, productive, and out of trouble.
Interestingly, children now spend roughly 7 and a half hours a day in front of a television or computer screen in the United States, on average. Rather than allow children to rot their brains with television or computer games, parents and adults can rely on playgrounds and other entertainment activities that require kids to be active, which promotes a healthier lifestyle.
At the end of the day, after school programs for kids are very diverse; there are generally options for any and all kids to stay productive, healthy, and happy, and parents are well-suited to find the after school program that works for them and their kids. Many times, after school programs can not only benefit kids by keeping them healthy, but benefit adults by giving them peace of mind about the whereabouts and activities of their children. See this link for more references.