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I just read your article about the unfounded dislike of Journey. Now you heap hate on Techno/House/Trance.
I listen to a mix of pop, techno, and rock while I work out (which I do a lot), but I find that most gyms place classic rock. I have no issue with with classic rock while I'm working on the car or driving an old pick-up... I *personally* don't like it while I run.
Nike has taken on the "music while you work out" thing with all they've got, and they have a huge number of mixes to offer to match with their Nike+ system. ( http://nikeplus.nike.com ). They even paid LCD Soundsystem to build the 45:33 or whatever its called. From the look of it, they've thought about what people want to work out to. Sure, some of it is "new enlightened" music like the Presets, Cut Copy, the New Pornographers, etc... but a majority of it is still driving electronic music spanning from LCD Soundsystem and Crystal Method to the Benassi Bro.'s.
I think they've spent some time looking into what people would workout to, if they could. I didn't see Journey anywhere ;)