There's always Dancing Stage aka Dance Dance Revolution aka DDR aka jumping around like muppets to all sorts of music (though a bit of a jap pop bias) The soft mats aren't extraordinarily expensive, and it's a reasonable facsimile of exercise, too. PS1 versions of the software are probably pretty cheap, second hand, and both games and mats work the same for ps1 or ps2, the different iterations of the games mostly just have different songs.
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the hatter