Charles River ice covered. the ice formed in wild, buckling sheets on portions due to the constant winds from the north west (we are getting the cold air from you guys in Alberta- thanks) the ride in this am was about 13F the ride home a bit more. But much less wind so it felt comfortable. Because I had a surge of feeling good as I left work I did some "telephone sprints" on the way home (picking a pole or a light post and sprinting to the next landmark- another pole or light post). Did a whole bunch of these in a row and wore myself out and seriously bonked about a 1/2 mile from home. Then remembered I'd planned to grocery shop (another 1 mile further). I struggled on to the grocery store and then crawled home with two grocery bags in the milkcrate. Ate like a pig when I got in the house. Between the frigid cold, the wind, the studded tires, all the clothing it feels like I'm working like a dog on the bike. It'll be nice to ride in one day in shorts and a tee shirt and a narrower profile tire.