Can Spotify's Algorithm Improve Your Workout? It Can't Hurt to Try

Running is big business. There are shoes, clothes, fitness trackers, apps, and countless other products that promise to make us faster--or at least distract us from our pain. For me, music is the only thing that's ever worked. So when Spotify announced a way to "change the way you run forever," I leapt at the chance. More accurately, I ran.