Thing is, the concept of Kaizen, Lean management & PDCA were invented by an american. Unfortunately our culture breeds impatience which cannot exist in a proper Kaizen world. Naturally, the Japanese picked up on this concept and embraced it much quicker and easier.
Kaizen simply means "change for good". This is a very successful concept to apply in manufacturing environments-just ask Toyota-the world leader in kaizen. Bodybuilding is all about manufacturing muscle so there is good reason to believe it works here too.