This morning before starting work I completed W5R3!
I *never* thought I'd do it first time, but I read ALL the posts on here about just taking it slow and I did. Possibly too slow! By the ten minute mark I was still breathing comfortably but my legs were not happy. That was definitely the bigger struggle, to just keep them moving.
When I started the cool down walk they tightened up a little (I think wondering what I'd just made them do) and even after stretching I'm much more aware of them than usual!
But, it's done! And as I like to always run on the same week days I now have two rest days to recover before starting Week 6.
I can't believe this works.