Best Workout Songs Of 2012

What marked your 2012 workouts more than, say Gangnam Style? Remember that June 16th run, propelled forward by Ne-Yo? Good times. But in all seriousness, the right music can be the difference between a lackluster and inspired workout. Research consistently shows that working out with a rapid beat can improve speed, endurance and even enjoyment of the workout. Putting together the best playlist can be tricky -- you have to account for not only music taste, but duration and beats per minute -- but...