In the end I decided to give it a go at W5, and to be honest I have found this first run easier than W4! You guys gave me a really good piece of advice telling me to move on. Up to this point I take Laura's word as gospel, if she says I can do it, then I can! I'm beginning to feel how my fitness is improving, I don't get breathless so easily although my hamstrings get tight and sore. I guess my body is adjusting. What exercises do you use to stretch?