Now, this hill will not only strengthen your legs, it will rock your lungs. This was my run this morning (Colorado Springs, Academy Hotel-->Research loop) -- I altered the beginning and end slightly and it ended up being 4.278 rather than 4.177 miles. Click on the Elevation link (large) on the left to see the elevation change. Starting at 6448, dropping a bit, then climbing 300'+ from about 0.67 miles to 2.5 miles, it was tough. The last 1.7 miles was GREAT, though! Pace was 9:26 mpm, even with about 3 walking breaks going up the hill -- probably due to the last 1.7 miles.
The run was during the long dawn -- it was cool at 42° but really nice for running. It was nice to have to wear a long-sleeved shirt and gloves for a change. According to weather.com, the sun was due up at 6:50 -- I started about 6:10 but it was quite light the whole time. Seeing the Rockies getting that early morning light was something else!
Run well, y'all,