I started doing 30 day experiments sometime in 2007 or so.
The reason for doing the experiments is simple — to create an awareness or just to try something out. I learn something with every 30 day experiment. Sometimes the lesson is something I can use in every day life and sometimes I simply learn to appreciate something. Every now and then there are more concrete benefits such as losing a few pounds, getting a bit stronger, improving my company, or gaining some specific knowledge.
If you are interested in sharing your 30 day experiments on this site, let me know.