I did a Walk Run Walk tonight. With my dog Sarah. We walk and the last few times I would walk for a few minutes, run for 2-3 blocks, walk for 2-3 blocks, run for 2-3 blocks, walk... I walked and started running and when I got 3 blocks down I still felt good so I kept running. I ran almost 1 mile (when I mapped it it was .95miles I ran more distance than I walked. I totally surprised myself.
I didnt have to stop because my leg muscles were cramping up. I stopped when I was out of breath. I probably could have gone longer. My lungs were sore when I first stopped. I was breathing pretty hard 6/1