A colleague at work started an Insanity workout group three days a week at our facility gym, back in January. I joined sometime in February, and it has been kicking my ass inside out since then. I honestly can't think of a better name for it than Insanity. But even after only three times a week for about four-five weeks, I am amazed at the difference. My cardio stamina is so much better, my back and arms are much stronger, and I feel fantastic (when I'm not sore). Then again, I started out way more out of shape than I thought, but hey.
I cringe when I think of the upcoming workouts, but the feeling afterward (once the nausea passes) is awesome. I'm thinking of buying it now and filling in a couple more workouts a week, but i have to say its much better doing it with a group together. Anyone else doing this or tried it?