100% trails and roads intervals 1:36:00 17.6 km (5:27 / km) +485m 4:48 / km
shoes: Saucony Trigon 5 Guide
3x12min interevals with 5min rest. Tried to keep my heart rate just a tiny bit under my threshold. I planned to do up hill intervals from Biel to Magglingen, but than I would have been all the time in the fog. Instead I did loops up on the "Mount Macolin", in deep winter conditions and under a deep blue sky... but not in deep snow, as I could always find groomed trails to run on.
I was positively astonished this morning to feel pretty good. Yesterday evening I was quite exhausted and was wondering if I could do those intervals... instead they actually felt pretty "easy".
XC skiing, skating 1:02:00 
Sunset skiing above the fog...