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Over the Top Music
I'm listening to their samples online, as I type this. VERY GOOD! They have music edited at specific speeds for various types of workouts. (ie Interval training, weights, cardio, etc)
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DynaMix Music
I've ordered a lot of CDs from them over the year. Their music is GREAT. I especially like their Indoor Group Cycling Series (have a spin class in your ears!), and their Yoga Fit series. You can listen to clips of all of their cds. They also have downloads.
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Power Music
They put out all of the Biggest Loser workout music, as well as, the Shape Magazine walk music...and a ton of other stuff. Very well produced. You can also download their music from iTunes
Power Music on iTunes (That link requires iTunes to open it)
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Yes Fitness Music
I've never ordered from them, but the samples online sound great. Check out
Mash Up Mania!
I just noticed you can pick and choose which tracks you want on your cd using their custom services.
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Techno Sweat
This appears to be another service that allows you to create custom mixes.
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Cardio Mixes
This one is new to me, but the samples sound good.
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MixMeister
This is software. If you already have a nice collection of your own music, and want to change the tempo to your favorite workout speed, I'd HIGHLY recommend MixMeister. It's VERY easy to use (if you can use iTunes, you can use MM.) You can speed or slow songs without changing the quality. Just type in the BPM you want and MM instantly changes the song. The free trial is here:
http://www.mixmeister.com/download_mmexp6.html