Used a DDR setup for rainy-day training when playing basketball and tennis in high school. Loved it, but kinda got bored with it after a while, because once you can do 10 footers in doubles with no bar, there's no real further challenge (RIP In The Groove with its 11 and 12 footers!). Also, the pads tend to suck unless you plonk down a few hundred for a metal pad which really takes up space.