Look at what’s number one on the list in this article.
Happiness can be fleeting under the best of circumstances. Even people who are basically happy have periods when they’re not, and for those who are prone to depression, it’s always a struggle. The core issue with depression (or one of them) is that it hijacks your urge to want to fix things, which obviously creates a vicious cycle. One strategy that helps with the hijack is to create a little routine that you stick to, and which can become a habit itself, and into which you build other habits (see below for more on this method).
When it comes to habits, virtually no habit you can form will exceed the value or productivity of an exercise habit.
Forbes Now: 8 Things Science Says We Can Do To Become A Little Happier. http://google.com/newsstand/s/CBIwob2Vpys