I've got my first 5K in 3 weeks.  The weather has been terrible but I got the chance this weekend to run on a treadmill.  I took advantage of it because I knew I really needed to run.  I noticed that it seemed a lot more difficult than running on the road.  Is there a reason for this?  I went ahead and went the distance but wasn't too impressed with the whole treadmill experience.  Thoughts?