This is my 9 yr old DS exactly. I've taken the focus completely off of sports and put it onto activity being needed just to be healthy. He likes Rollerblading recently. And I'll often say he needs to go for a walk before watching a show, or that he needs to run as fast as he can from one side of the backyard to the next 4 times. I've found that it needs to be more about fitting in bits of activity rather that a focused sport for him. He'll also do the treadmill at the gym with me (esp the ones with the tv