that is playing during the hamstring leg lifts (on the step) in Legs and Glutes? Course, its not the original version but I can't remember the title! Driving me nuts!
I don't know which one, but here is the songlist in the workout..
I'm Rushing
Band Of Gold
Do What You Want
Wishing On a Star
You Spin Me Round
One Sweet Day
I Can't Go For That
Ai No Corrida
Fantisy
Wonderful Life
Linger