If you’re a runner or a gym user, chances are that at some point you’ve put together a workout playlist of some sort, full of the kind of Rocky-esque power ballads you want entering your ears and coursing through your veins as you strive toward physical perfection.
According to a patent application published Thursday, Apple could be looking to take a lot of the pain out of that kind of gain. The application in question deals with a handheld or wearable device capable of controlling the tempo of music so as to affect the mood and behavior of users during exercise.