This concept or secret I've learned and implemented in the Fat X exercise program and in each of the workouts is the concept of synergy. Synergy is what makes the exercises in each of the workouts interact and cooperate with each other in such a way that they produce a combined effect greater than the sum of it parts or their separate effects to produce a highly effective fat burning exercise program.
In putting together the Fat X exercise program not only did I choose high quality effective exercises, but I organized them in an order and intensity level (in respect to one rep max) to work synergistically. I've constantly been asked about "the secret" to the success of the Fat X exercise program, and again it's not so much a secret as it is this very important and under utilized concept of synergy.
If you haven't already tried the exercise program, check out the workout videos. They're all free and if you need a little extra help you can instantly download the The Fat X Workout Guide. It's only a few bucks and it helps support the blog.