A bit of a jump

So, I got to the 4 minute mark today on my first leg, and didn't feel like stopping, so I continued.  I made it until 7 minutes before I felt I needed to stop, so I switched to a 7 minute run - 2 minute walk x 3.  This increases my running time by 5 minutes, and doesn't change the overall workout time by very much.  By the 3rd leg, I was feeling pretty tired, but it seems like my cardiovascular is catching up to my legs.   Felt good to get to the finish line today!