I've just done W3R3 and I feel almost as if I've decreased in progress rather than the opposite. I felt amazing after doing the first one, was really pleased at how well I took to it, still felt good after the second although not quite as great as the first, and then this third one was really difficult! From the start I felt wobbly and lost my breath much quicker. I still completed each run without stopping but it was really tough and I was a lot slower than normal.
Any advice/experience of this? I'm planning on starting week 4 on Monday but will see how I go, perhaps I need to repeat week 3 before moving on. Which is strange as if you'd asked me earlier this week, week 4 wouldn't have seemed half as daunting!
Confession: I did have a few drinks last night so I wonder if I could be a little dehydrated...?!