Arrrghhhhh that was hard work. My calfs hurt when I started running and not sure how I managed 28 minutes. It was too warm and my breathing was terrible. People were looking at me on the seafront as I ran past them as I must have looked and sounded like I was dying! I threw my bottle of water over me in the end! My left calf is still hurting. But I done it. I ran 3.69km so cannot see me doing 5K in 30 minutes.