Well done, Joost. Did also a long training today at 20.30 pm: 10 tours on the finnish track of Balen (14,5km) in one hour. It was icecold (minus 9), had to run fast to get warm. Afterwards my hands were frozen and there hung icicles on my eyelashes. Not really my weather and temperature.
Finnish track is a bit slippery, maybe an indoor-training is healthier with this weather.