I have to admit, I prefer listening to audiobooks, esp. Terry Pratchett.

This is a fantastic thread! My list is a definite motivator for me, and I'm always looking for new songs to add! Some of the ones that really push me that extra minute or mile are:

If You Want Blood- AC/DC
Dog Days are Over- Florence and the Machine
Teenage Dream- Katy Perry (especially the skinny jeans mention!)
King Nothing- Metallica
1901- Phoenix
Cuz I Can- Pink
Rollin' in the Deep- Adele
Tik Tok- Kesha
Filthy Gorgeous- Scissor Scistors
Red High Heels- Kellie Pickler
Shut Up and Let Me Go- The Ting Tings
Poker Face- Lady Gaga
Upside Down- Paloma Faith (HIGHLY RECOMMENDED! It's such a fun song and really pushes me for some reason)

So many, may more, but these are some of my favs!

Super Bass - Nicki Minaj
Girls (Run the World) - Beyonce
Hello Good Morning - Diddy
Shake Your Pom Pom - Missy Elliott
On the Floor - JLo/Pitbull
(any Pitbull songs <3)
Buzzin - Mann
The Potion - Ludacris
any Michael Franti/Spearhead