So...I said I'd have a go, and did most of their second run of week 2 with them, and then today I did the third run of week 2 with them, so it was their 6th run and my first complete run, but it seemed to go ok!
I have been feeling low in energy and mood and a bit tired and achey, especially my knees, though nothing specifically wrong, so wasn't planning to do this, but since I was out there anyway I had a go and today I seemed to manage ok, kept up etc so..maybe I will see what week 3 is like, tho am aware that I didn't do week 1..