Playstation One
Because I kicked ass on the dance mat, and that was the only exercise I got. Now the playstation's gone, I have no way of using the dance mat... and therefore I don't have any incentive to exercise. I mean going for a run is good and all that - but nobody shouts "You're a dancing MACHINE!" as I'm dragging myself down the road. It's just not as fun.

Plus, I never completed Tomb Raider.