I'm astonished with myself that I've got this far but week 3 was a big step up for me. I'm practically crawling during that last 3 minute run but I made it. I do find it gets better as the week goes on but haven't enjoyed week 3 as much as the other two! My left shin is hurting a bit as I've run the last two sessions so I'm going to add another couple of rest days before starting week 4. Is that wise or likely to make week 4 harder?