Just 2 days after 50degrees it's one of the worst days of the winter, mostly because of the wind. But since there was no snow I could go out to Saylorville and run on the bike trails and dirt path. My usual hill was into the wind so I went to the other side. Unfortunately they've done some work since last time I've been there and they rerouted the path around the peak of the hill. It still worked though. Anyway, 4 minutes tempo then 5 hills around mile pace. Hill was nearly 1/4 mile long. Never felt too strained during but the cooldown and post-run I've been really tired.