I'm half way through week two of this schedule and already find that after four of my seven 2 minute runs I sort of hit a wall and can't imagine I'm going to make it. But then somehow I do, and my body feels as though it's accepting what's going on, and I guess that's what getting fit actually feels like. Also telling yourself "just two more to go" helps mentally.
Looking at the weeks to come I'm very excited even though I know it's designed to never let up on the effort (or pain!)