I powered through and made it through the full 25 minute interval! It was close there for a minute and by the end of it I felt nauseous but I made it!
The downside is now I have no excuse for not doing it again.
I put the speed at 3.5, which is where I’m most comfortable for these longer runs, and left it there for most of it. I only had to slow it down towards the end where I felt like I was cramping up. And yes, I remembered to do some stretching afterwards before hunching over my desk to write. And I bet my recovery will be all the better for it. Especially since I have to start week 8 tomorrow.