Get fit with these Top 40 hits!

This month at SHAPE, we've assembled a workout playlist straight from the pop charts. The cuts from Lady GaGa and Kesha might already be familiar to you, as they're mainstays in the gym. But, the list is rounded out by Glee's take on a Journey classic, a thoughtful--yet anthemic--cut from Lily Allen, and a jam you'll likely recognize--even if you don't know it by name--from Company B.