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Hi
I'm not sure whether your son has a Wii or a PS2 but if he has there are plenty of interactive games you can buy such as Wii sports, Wii fit etc for the Wii. I don't think there are as many for PS2 but I know my son loves playing on Eye Toy which includes sports activities, an army boot camp and lots more depending on the game as there are several.
The only other thing I can think of for indoor activities are gym equipment such as a cross trainer or rowing machine but this might be too pricey or take up too much space.
I hope you get some more ideas.
Angel x
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