I did the Insanity workout informally for about 3 weeks, and now I'm in week 3 of the official program. In short, it's awesome. The workouts are extremely intense, and in a very short time I already notice physical differences, in addition to increased energy and stamina. FOCUS: is anyone else doing the Insanity or P90X workouts (published by BeachBody)? What are your results? Any tips to share regarding the workouts, nutrition, follow-up after the program is done? Any criticisms or areas the program(s) could improve? If there's a better regimen, what is it?