I didn't find any one of the weeks in particular to be especially hard physically. Mentally though, the first long run (of 20 minutes, I think) was daunting beforehand.

week 8 is definitely the hardest for me thus far- even when I made the jump to 20min, I was feeling strong. I don't think my difficulty with w8 is due to the program though- I think my body is just trying to get over a "hump" now that I'm consistently demanding the longer run. everyone is sure to be different though.

Week five, without a doubt. I finished that 20 minute run the first time through, but felt bad, bad, bad. Lost all motivation to run the next time, so I went back and repeated week 5. Best decision I think I've ever made. In the past when I'd hit a bad time like that, I'd just try to push on through, and then shortly after that I'd give up and go back to "I'm just not a runner" or "I just don't like running". This time I have let myself slow down and slow down and not push on when I felt bad. And I'm now running more often and longer than ever before in my life, and, most importantly, I like it.

so far none of the weeks have been too hard for me to do. today was the hardest though. im in week 6 and the first part of the run i went too fast so the second part was super hard.

I distinctly remember: W4D2 W6D1 and D2 and W7, W8 and W9D1 and W9D2. Let's just say the last 3 weeks were a push for me.