1. Raise your activity level
2. Take a walk outside.
3. Reach out.
4. Rid yourself of a nagging task.
5. Create a more serene environment.
6. Do a good deed.
7. Save someone's life.
8. Act happy.
9. Learn something new.

the original artical below
http://shine.yahoo.com/channel/healt...inutes-444895/

Kinda cliche but full of everyday truth and work well actully.
Enjoy