The Best Workout Songs

I need your help.

After being humiliated yesterday on Fun107.com (after Larry posted a picture of me in my high school wrestling singlet), I decided it was high time to hit the gym. I spent half of the time hitting the "skip" button on my iPhone to get to the next song. I need to make a solid playlist of "no messing around" workout songs.

What are the songs that get the adrenaline flowing when you're running or working out in the gym? Leave your comments below. You've seen my muscles (or lack thereof) I need to make this playlist as long as possible! HELP!

Here's what I've got so far:

Metallica "Enter Sandman"

Guns and Roses "Welcome To The Jungle"

Anything AC/DC