If you need a theme song for motivation, here's the best one

I was at the gym earlier and was on the elliptical for the first time. Two minutes in and my legs were SCREAMING! I decided that I was only going to do 5 minutes and then at 4:30, this song came on. I found myself staying on the machine for the rest of the song. Granted, I only did 10 minutes on that machine, but it was twice as long as I had originally said I was going to do. This song is a bit repetitious on the lyrics, but it's got a good beat to walk or run to (or in my case, try to kill yourself on an elliptical to).

I Won't Back Down by Tom Petty and the Heartbreakers

Well I won't back down
No I won't back down
You can stand me up at the gates of hell
But I won't back down

No I'll stand my ground, won't be turned around
And I'll keep this world from draggin me down
gonna stand my ground
... and I won't back down

Chorus:
(I won't back down...)
Hey baby, there ain't no easy way out
(and I won't back down...)
hey I will stand my ground
and I won't back down

Well I know what's right, I got just one life
in a world that keeps on pushin me around
but I'll stand my ground
...and I won't back down

(I won't back down...)
Hey baby, there ain't no easy way out
(and I won't back down...)
hey I will stand my ground
(I won't back down)
and I won't back down...

(I won't back down...)
Hey baby, there ain't no easy way out
(I won't back down)
hey I won't back down
(and I won't back down)
hey baby, there ain't no easy way out
(and I won't back down)
hey I will stand my ground
(and I won't back down)
and I won't back down
(I won't back down)
No I won't back down