On friday, I did W5R3, 20 minutes with no problem. Last night I set off to do W6R1, and didnt make it past 4 minutes into the second run. Spent half an hour walking and mentally beating myself up - I couldnt understand why as I'd done 20 mins, so 8 shouldnt have been a problem.
Spent a while thinking about it, and realised.....
On friday, I did a short day in work, had a light lunch of pasta salad, and ran on a treadmill with 0 gradient. Over the weekend, I had a tummy bug, whih meant little restful sleep and not really anything to eat, then a busy day in work, skipped lunch, got home and went straight out for a run in the 'real world' - where there's hills, and headwinds.
Thinking about it, I really didn't set my self up for success.
Lesson learnt!!