There is a wonderful TED talk by Shawn Achor in which he explains that most people have the success and happiness equation backwards. Whereas most people believe achieving greater success will result in more happiness, he argues that being a happier person will make you much more successful.
He goes on to say that happier and less stressed doctors are 19% faster and more accurate in diagnosing patients.
What was really interesting was his list of small things each person can do daily to help achieve or be happy. Here is a screenshot of his slide of those things:
Only #3, exercise, is a completely embedded habit in my life. The rest are habits I intend on adopting into daily practices.
Here is a link to this great video: