Warm, cold, warm, cold, warm, cold.  Things we've learned this winter... 1)  Weather people have the greatest job in the world ("Don't look at me, I gave you 50/50 forecast")  2)  You need to take advantage of these windows of warmth before the next soul sucking vortex latches on.

So, push back from your desk right now, 180 degree counter clock swivel in chair, stand up, lock eyes on exit, and walk outside.  Stop for nothing.  Stop for no one.  Let their confused gazes and requests for "circling back sometime today" be the fuel you need as knock out a little road/trail work.

Top 10 Trail Runs in the U.S. Parks

Photograph by Michael Hanson, Aurora Creative/Getty Images, http://adventure.nationalgeographic.com