What is Your Favorite Running or Workout Song?

I have recently become an emcee for the Insane Inflatable 5K. The same one we had here in Lubbock recently. So I need some really god music suggestions to keep the crowd energized and in a good mood.

I've got a TON of great songs in my playlist. Obviously working for a radio station  have access to almost any song in the world. But I wanted to make sure I wasn't missing a song that you know personally gets you geared up for running, or just a general good time. Comment your favorites on our Facebook page and help me out! Please?