Celebrities who have used the home workout program P90X at some point in their lives to get fit include Ashton Kutcher, Demi Moore, Pink, Sheryl Crow, and Michele Obama - and they weren't getting paid for it. In fact the makers didn't even know that some of these celebrities were using them. Ashton Kutcher even tried to keep it secret. All this free publicity cannot happen if the P90X wasn't any good; it's one of the most popular home workout program you can find. P90X3 takes the best moves from P90X and P90X2, make them better, and pack them into 30 minutes. It's about getting it done fast so you can get on with your day.