1) Bubble Bobble (my first video game I ever played, totally a nostalgia pick)
2) Paperboy (game is still hilariously awesome)
3) Crazy Taxi (so good!)
4) Does DDR count? Because if that's the case.... any one of those. I was in the best shape of my life when I was obsessed with DDR.
5) XMEN 6 PLAYER.... probably the most fun you can have with a group of 6 friends. Just absolutle chaos.