I've always known it as the '30 day challenge'.
There are many blogs about it from people trying it out for themselves. It's basically to find out if your body can cope, and if you like it.
For example I tried the challenge of becoming an early riser, which worked for a short while before my girlfriend got annoyed.
I would say, make sure the challenge will benefit you, make you more productive, or make you more "happy".
Another thing is to try and keep a blog and document your experience with the challenge, this will be a great help to you and others trying the same challenge.
Above all is, you must stick to it, if you miss out a few days, or only do 15 days, its pointless and you will have wasted your time.