>To mspina: to what do you attribute your success with Tony
>versus Cathe specifically?
Ah, the million dollar question! Here are my thoughts, as I have actually spent a lot of time pondering this.
1) Structure of individual workouts themselves: I think there really is something to alternating body parts, rather than completely frying one before moving to the other. In the X workouts, Tony has you rotate through one exercise for each muscle worked. So you'll do a chest exercise, then back, then chest, then back..... The shoulders & arms workout goes: shoulders, then biceps, then tris, back to shoulders, etc. So you get short rest periods between sets for each muscle group - which I think makes you fresher and able to push at 100% for EVERY set. With a Cathe style approach, you are often totally fried by the last set, and can't give it your all.
2) The structure of the rotation as a whole, both at the weekly, and monthly level. The muscle confusion aspect introduced by the phases, interspersed with the "recovery weeks," just work WONDERS. I don't think people understand not just the value, but the *necessity* of recovery days/weeks (this was certainly me, pre-X).
3) The cardio component is intelligently added, rather than being balls-to-the-wall every session. One high intensity session per week, one medium intensity session per week. That's it. If you are trying to build strength and definition, catabolizing your hard work with too much cardio is counterproductive.
4) The emphasis on flexibility, both in the workouts themselves, and the addition of the VERY challenging YogaX, scheduled into EVERY week.
That's what I've come up with.
m.