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music for working out is either of Babatunde Olatunji's Drums of Passion CD's: The Invocation or The Beat. Beautiful, steady rhythms, long tracks, virtuoso playing. Drums are the closest natural sound to the human heartbeat, and I find these albums warm and inviting as well as physically invigorating.
Also, I really like C&C Music Factory's Gonna Make You Sweat. It's an older one, but it's perfect for physical exertion. Plus, it's funny too!