17 degree run

17 degrees this morning, with no wind, which meant it was actually pretty warm while running. I was wearing the appropriate layers, and as long as I didn't stop, I did not get cold. It was a very good run actually...7.27 miles over an hour and 7 mins...i felt strong from the start and maintained a good pace (9:17 avg). On one part of the run the road was blocked off by firetrucks, so I had to divert down a steep hill, which meant I would have to climb back up that elevation to get back to my route. That first steep up killed me. My heart rate spiked to over 180 and my pace dropped to about 10:30. Guess that means I need to work on my hills!