I can't really say much other than I felt awful from about 5 minutes in and only made it all the way through by sheer blind stubbornness!
I was pretty much counting down the minutes (which I know is a bad idea and pretty demoralising) but I feel like if I hadn't been reminding myself of how much I had already done I would have given in about 15 minutes through. But since I refused to waste so much running, I made myself reach the end.
My legs were practically dragging, mind you, and it's really awful when other runner's run past you because you're going that slow. And I'm also really aching now. But 25 minutes of horrible running is still 25 minutes!
Here's hoping Week 7 goes better!