1) You have time to listen to music on the mp3 player of your choice, whether it's your favorite band or you're listening to someone new!
2) Your heart rate gets up and your body's moving, which almost always feels good.
3) Good exercise.
4) You have time to think about things and let your mind wander. For me, it can be a fantastic source of inspiration as well.
5) Getting out of the house can be cathartic (if you're as messy as I am)!