Activity is important for kids of all ages. But when it comes to regular exercise, what’s the best way to get them moving? We all know that kids have energy to spare—the question is, what’s the best way for them to burn it? Is it better for kids to join a gym, or play a team sport? While it may seem like the best thing to do is just let them run in circles in the yard like puppies, the fact is, there’s a time and a place for different physical activities in a kid’s life. The number one rule…