I know this sounds silly, but.. (ideally, if it could be popularized as a sport..) I'd choose:
1. Handball (I LOVE handball- slicees, splicees)
2. Tether ball
3. Nation Ball
4. Old school rollerskating (at the rink w/disco balls!)
... I know, they're all literally elementary.
Other than that:
6. Indoor Rock Climbing
7. Boogie Boarding
Although I workout I'm not as athletic. #6 would be something I'd love to learn! #7? The water quality in my area's questionable (due to offshore drilling); it was a past-time favorite.