There are many ways to use this and many different applications.I still use this principle to this day although I no longer powerlift by making sure to work on all the aspects that I need to maintain structural integrity similtaneously.
Chek's training order of progression is: flexibility, stability, strength, endurance, power. Of course if one is missing one aspect of this list entirely than that should be focused on specifically until one is qualified to work on the next level. But once basic levels are achieved they must be maintained and developed according to need and natural levels. For instance I don't have to worry much about maintaining strength as I have more than I need from my years of training so heavy and hard. I can slack off strength training per se for many moons and get it back quite quickly.
I can't, however, do the same thing with my mobility,stability and flexibility. So those have to not only stay in the mix all the time, they have to stay at the top of the list.Same with muscles. People LOVE to train their strong points and hate to train what's weak but that is exactly how one proceeds if not making progress is the goal. Natural strengths will require very little work. Weak points need to be hammered continually in order to come up at all, much less fast. And weak areas are the first to fall off once training diminishes or reduces in intensity.
For example, I have hardly done any upper body training in the last three years; mainly swings and snatches for my(much) weaker lower body. And yet, just after a month or so of upper body training with the clubs,my upper body is growing like a weed!If I took three years off lower body training I would hate to even guess how long it would take to get some strength and size back in my lower half!
The difference is if one is truly training to improve or just to get a good workout and do what is already strong in.
When one reaches their limit in a classic lift, be in a squat, or a press or a snatch, there is always one( at least)major muscle group that is holding you back. When you fail to stand up from a limit squat it is not the SQUAT that has failed but rather a specific muscle(s).Usually the lower back/abs. Same with a bench.It's not the bench that fails but weak lats or triceps or shoulders. And, as Louie loves to say, the muscle makes the groove. So if you push your bench press back to the rack instead of straight up it's pretty much a guarantee that your shoulders are stronger than your triceps.SO that means WAY more tricep training as well as working with lighter weights and closer grips to develop what's weak.Train what's weak and you become stronger.Train what's strong and stay where you are. Unless you are a super natural, then this isn't for you.
Here's two great articles on conjugate training. Must reads.
Conjugate training part one
Conjugate method part two