I still love this workout, even though it's gotten progressively easier as my fitness level has improved. (Towel Hoppers used to leave me gasping for air, but after a month or so of working out with Insanity, jumping from side to side for a minute isn't particularly challenging.)
What keeps me coming back to Core Syn is the attention paid to the entire body -- upper, lower, and core -- along with its mix of resistance and cardio exercises. No other P90X workout is quite as well-rounded. If I had to choose just one P90X DVD, this is the one I'd pick to maintain my fitness gains. (Yoga X would be a close second. And while I'd keep doing Ab Ripper X as well, I don't need the DVD -- like most avid P90Xers, I long ago memorized the entire routine.)
