Determining the right amount of clothes.

Layering up seems like a fairly easy thing to do. You look at the temperature reading and also think about cold you just were as you walked into the building. Based on that and the fact that the sun had been hiding all day, I put on 2 layers, not including the jacket, gloves and ear warmer. Within minutes of running, I was wishing I had opted out on some of it. I finished my run and ended up sweating more like it was a warm summer day, but have learned my lesson: think twice before bundling up.