DS1 is clumsy and doesn't enjoy sport as he feels he's not very good. Just as well really, as it seems to me that before they're very old, there's no place for them in teams/ clubs unless they are good. 
Anyway up to now, he's had loads of exercise because being outdoors is like letting a dog of it's lead and he'll just run and run in the course of his playing. I do know though that that won't last forever and he'll grow out of running around games, so what do you do to make sure your older children stay active?