Best Workout Songs of 2009

So many pumped-up tunes came out last year — like Madonna's "4 Minutes" and "Keeps Gettin' Better" by Christina Aguilera, to name a couple. While those songs definitely still inspire me to get moving, there are only so many times I can "Put a Ring on It." Good thing 2009 brought us some bouncy, beat-filled songs to add to my mixes. Take a listen to each song and then tell me, which is your fave from this year?