This song "Absurd" by Fluke is in my opinion by far the best song for doing some kick ass cardio work. I listen to this song whenever I want to take it up a notch on the treadmill, elliptical, or bike. It gets my heart pumping and the muscles going. I've listened to this song since I first heard it in the movie Tomb Raider when Angelina Jolie goes head-to-head with some killer robot. I sware I can imagine myself as "no-fear-open-a-can-of-whoop-ass" Lara Croft when I listen to this song. Quite motivating! Buy "Absurd" on