P90X is great if you take it easy on yourself and don't push too hard. A person not used to exercise could REALLY hurt themselves trying some of that crazy Sh*t! LOL That makes sticking with it more difficult.
I'm also a complete worshipper of the Cindy Crawford workout video. The easiest way to lose weight is follow the 'Eat More, Weigh Less' nutritional guidelines. I have never failed to lose #20 when I followed that (when I NEEDED it, of course!).
Aside from the obvious answer of your fav activity!!!!!!........

