Just to add to Janice's comment, P90X didn't just arrive out of thin air. It had been tested for awhile on real people designed by experts, to see what worked. The series is designed to go together as a complete set. That is why CardioX may not be as intense as Cathe's workouts. When you put the whole series together, then you understand why it was made that way. You can tell the designers knew what they were doing.
Cathe's workouts are more endurance, circuit and high intensity step. While this type of workout definately has a place in one's workouts, P90X is a strength training workout, and a much needed one I might add.
Cathe's Slow Heavy is the closest I can see to P90X in order to get this kind of strength gains. Cathe's other workouts can be modified to fit the P90X formula but.... there would be alot of push start and stop buttons. There are moves on the P90X that work my legs harder without having to tote a 50# or more barbell on my back.
P90X is a different style of workouts that is on the market today. It is not for beginners. There is a fitness test one is asked to do before starting. and..... The variety of push ups and the pull ups works the back and chest different than dumbells can do. Even by using the bands over my power tower, this is working different chest and upper body muscles.
P90X.... It just may change some lines on thought on how one works out. Perhaps it will even change the industry. I sure know it changed my way of thinking.
It is based on the way Olympians or athletes train.... 3 or so months of strength, and then a month or less of cardio just before the event to define the muscles.
6 days of workout, 1 day of rest or stretch.
I would never have thought that I...me personally, would stay on a rotation for 90 days.
But... my two hours of workouts before, 1 cardio and then a weight, circuit or endurance, my body peaked. I thought that just by rotating all my Cathe's I would get the look I wanted. Yet... All the endurance and cardio was not allowing my muscles to grow or to have any strength gains because the too fast pace was burning up what I was trying to build! Now I'm only working out an hour and I'm really worked after the session.
Now....I'm getting somewhere as I now know what to do to tweak my workouts.
Guess I sound like an infomercial too.