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...it is barely audible over the noise generated by the cardio machines and the fans.
I actually like listening to podcasts at the gym--Wait Wait Don't Tell me is good, it makes me laugh. This American Life is hit or miss. These seem to work for either cardio or doing weights.
When I run (outside) I like Erasure, New Order, and other 80s synth-pop. I'm also fond of The Chemical Brothers and Orbital. My very favorite running album, though, is--go ahead and laugh--Cher's Believe. The You-Go-Girl!-iness of it is perfect for when I'm having a difficult run.