Swiss balls (those big inflatable things that people have at the gym for doing crunches on) - everyone should buy one. Why?
They're great to exercise on, fun, easy, you can do little bits here and there, versatile.
They make a great chair - sort out bad posture, cheaper than most office chairs too.
They're great fun to kick around and break things with.
So? Why are you posting this on a swinging site CM? What interest could this possible have for us?
Well..
Try having sex while sitting on one. Oh. My. God.
Anyone else got any good 'dual purpose' objects? (phallic shaped things dont count - far too obvious!)
CM