I hit 18 minutes on Sunday. I ran on the outside track which seemed to a little easier on my shins. It really doesn't seem to bad now. I am still huffing and puffing but I am going at an 7.5-8 minute mile pace. I should probably slow it down to a nine minute mile pace. From what I've read, if you run slowly in the beginning you end up with less injuries. So, next time, I'll run a nine minute mile pace. As an added bonus, my inhaler worked so I didn't cough up a lung when I finished running. 20 minutes today