Pump it up!

I am proud to say that within the last month or two, I have made going to the gym a semi-regular routine (about 3-4 days a week for 45 minutes.) I have never been a huge fan of the gym. But my wonderful iPod makes the experience much more enjoyable. If I have the right song going on my "Gym" mix, then the time on the elliptical or weights flies by, making the gym much less dreadful.

With that in mind, I only have 156 songs on my gym mix. While most of them pump me up (by the way, Elvis Costello's "Pump it Up" is indeed part of the mix), I feel like I am going to get sick of these songs soon. And once I am sick of them, the gym might become a dreaded experience once again.

Stone Groove was nice enough to give me a code that he got from Bose for 15 free downloads from iTunes. Thus far, I have only used 3, with 12 remaining. I would love if my valued readers would be so kind as to help me with suggestions on good motivating gym songs to download from iTunes. Handwashings: What got you through the NYC Marathon on your iPod?

Here are some examples of what is already on the mix. Most of the music is not very good, but it does the trick:
Beastie Boys, Britney Spears (taken from my dear roomate), Gorillaz, Kanye West, Jay Z, Ludacris, Outkast, Archers of Loaf, Hives, Hot Hot Heat.

Any suggestions would be very much appreciated.