frosty fog in the forest

Just had a wonderful 5.1 mile run in the forest with my running friend.  We didn't want to do a long run this week and so decided to do some exploring.  We set off and found a great path which took us up some lanes and through fields.  Really enjoyable and managed to get a load of hills in again.  I really enjoyed it and came back really refreshed.  It was quite cold - around -1 and the fog which has been hanging on all day was getting worse but that added to the run.  Great run.