I started Week 6 this morning. I went out thinking nothing of 5 min / 8 min / 5 min runs, after managing to complete 20 mins on Friday.
It was a total struggle. This was the first time I've felt almost unable to finish and came back to seriously aching legs.
I was blaming the fact that I've been tired, had PMT, spent yesterday bending down doing housework etc etc. But now I read through blogs and discover that a lot of other people find this one a struggle too.
I don't know whether it's just that you get cocky once you've done a long block of running... (5 minutes sounds OK to me but seemed like an eternity)....or whether I'm still recovering from the 20 mins, but it was hard.
Anyway, with the usual tips of slowing down a bit, breathing and pacing properly, I made it through. I'm hoping the struggle against tiredness will reward me with a bit more stamina next time. We'll see how it goes after a rest!!