I did W6R3 yesterday and for the first time, failed to keep running for the entire thing. At half way I was getting tired and slowed down a bit, then around 20 minutes into the running I had to slow to a fast walk for a minute or so and then again a few minutes later. I did keep moving for the entire 35 minutes but now today my legs are suffering for it.
I was considering repeating it before moving on but I notice week 7 is just 3 runs the same as W6R3 so I think I'm going to carry on but might repeat week 7 before if I'm still struggling by the end of the week. This seemed like a really big step up from the previous runs.
That said, when I started this I could barely run 100m and I just 4.2km, I'm really surprised how you can do that in just 6 weeks!