I try to do a monthly challenge each month. I've been doing it most of my twenties.... and by that, I mean that I did it most of my twenties and I am continuing to do it now that I'm in my thirties. I've done all sorts of things, mostly dealing with diet and/or health.... no sugar, 30 days of yoga, being a vegetarian for a month, no dairy for a month.... you get the idea. I've done vegetarian and I've done no dairy, but before this month, I had never done vegan. Truly, I had never even considered it.