Even my feet warmed up in the the end. And I got to hang out with the robins and leave my footprints in the frosty grass... saw the sun dazzling off the frosty leaves as it began to melt, and felt at one with the world.
A fair bit of my run is up hill- at least two thirds. So I reckon if it was on the flat or treadmill 5k in 30 minutes would be in the bag.
I loved it! Running. It rules! Never ever thought I'd be saying that, in a million years. But it does.