I just finished my first run of week 3. The first 90 seconds was actually a little hard -- it felt like I hadn't fallen into a pace yet -- but then I was surprised at how it got [a little] easier! The nicest thing was noticing during the runs how it felt like even though my legs were tired, but my heart/lungs weren't, so much. It felt like I could keep going. Although the last minute of the final 3 minute run *was* very difficult.
I remember only 2 weeks ago being very out of breath after 1 minute and wanting to flop onto the grass after each one - it feels so good to see this progress! Being able to run 10-20-30 minutes still feels like a pipe dream, but I can't wait to see if I can actually get there.
Also, I think I'm finding the fact that there are only 4 runs easier, even though they are longer...