Motivation in winter

One of the basis of Tai Chi is living in harmony with nature and natures energy. In the current  current dark snowy conditions I have mentioned that  my motivation to go for a ran has reduced. Last night I went for a walk in the snow, it was very quiet. There was no wildlife to be seen. I suddenly realised that I am not suffering from lack of motivation but rather my body is tuning into natures cycles and is keeping itself warm and preserving energy and this is reflected in reduced motivation.