Here's my latest adventure in the fitness domain: crossfit. I love the intensity as well as the varied nature of the workouts. Its emphasis on functional movement really makes a lot of sense to me now as I get older (and hopefully wiser). Really, what's the point of trying to have a 400 pound bench? It's more useful to have strength that you can apply, which crossfit really gives you with its mix of gymnastic movements and powerlifting. I've found a pretty good article on it, and I can assure you that the title, Sweat Storm, is very applicable.
I've been somewhat hit or miss with this due to the busy schedule, but the nice thing is that many workouts are in the 20 minutes or less range (but still very high intensity). I haven't had the discipline to simultaneously change my food intake, so I'm not losing weight with this, but that can come after the MBA. For now I need something just to maintain a basic level of fitness.