Been following a bit here and there-- I'm in Week 4 also!
This one's been really hard for me. I ran Sunday and couldn't finish the last 5 min jog-- only did two minutes. I should have walked a minute, then completed but ugh-- no way. Monday, I did this: in the last 5 minute run, I gave myself a 60 second walking break and did finish. Yesterday (Tuesday) was the first day I got through the whole thing and man it felt great. I got new workout music-- Podrunner's podcast, available on iTunes. I tried using the other one that's loved here but the music wasn't fast enough for me and I'm able to keep track of my time as I'm on a treadmill. So I'll be going again today and then taking a break until Monday where I hope I can do it again!
(I know, my schedule's wonky, but it's because I'm in a long-distanceish relationship and we share weekends and there's no treadmill or gym for me at my boyfriend's house!)
Seeing you all makes me motivated. Keep going!! 