Eminem's 'Till I Collapse' dubbed the ultimate workout song. Do you agree?

Sorry, Katy Perry. Tough luck, Kanye West. Eminem's "Till I Collapse," featuring Nate Dogg, took the title of Ultimate Workout Song in this year's March Music Madness online tournament put on by folks who know their workouts: Gold's Gym , plus Men's Health and Women's Health magazines.

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