I completed the first run of week 7 (25 mins continually running) yesterday. Up to now I had a playlist that consisted mainly of 70's disco hits as they had a good beat. However 'Happy' by Pharrell Williams popped in there and suddenly it was like an epiphany!! I was running really comfortably to the rhythm. I looked up how many beats per minute the song was and discovered it was 160. So I made a playlist of songs that were just , but also were very consistent in their rhythm, like "I'm a believer" by the Monkees etc.. The difference it made on my first go out at 25 minutes was incredible. I was actually smiling!! Don't know if this works for everyone but it definitely made it feel so much easier.