On Monday I completed W5R3, not easily but I did it, so when I heard what W6R1 entailed I thought it would not be a problem, back to shorter runs with walking breaks. However although I managed the first 5 mins I could just not finish the 8 min run and ended up walking after about 5 mins. I then walked until the last 5 min run which I managed ok. It was the muscles in the front of my thighs that just gave up and would not work. Think I will have to have a 2 day rest after long runs instead of just oneday off. also perhaps I need to visit a physio for advice on some exercises to build up those muscles. They also let me down W4R3.