[facebiff]

First, congrats to this guy for building and releasing software that solved a problem he had.

But in my experience, a good way to improve your pace, become more consistent, and improve your running form in general, is to NOT WEAR HEADPHONES. You need to be very aware of your surroundings, mindful of your breathing and heartrate, and aware of your cadence to really have a good sense of your form and speed. Seeing an elite runner wearing headphones during a race is very rare; most claim it's because they need to _concentrate_.

Playing music while running not only makes is harder for you to hear what's going on around you, hear your own footsteps, etc, but it's a huge mental distraction (for me at least). If I'm listening to music, even passively, I'm more likely to revert to a sloppier form, change pace, etc.