I know, I know.... I left ya hangin'. Sorry about that.
Okay, so I couldn't hack it. Maybe it's genetics? I do come from a long line of doughy Italians. Growing up, I was an alto in the chorus and editor of the school newspaper. I have never run a marathon or played organized sports.
Then again, I did jus' fine with P90X. (Twice.)
The bottom line is that I would personally only recommend Insanity for those who are highly athletic and/or under the age of 30. No matter what, if you have ANY past injuries, I would steer clear.
For the effort, I think P90X is far more bang for the buck, much safer, and way more fun. For beginners, I would start with the regular Power90, also by Beachbody.com. Don't let the lack of "X" fool ya' -- it's a great fitness program with a much simpler nutrition plan than the others.
Thanks for your ongoing support. I hope my experience was helpful to you!