ACSM Certified Personal Trainer (#20)

How many times should each stage of the Plan, Do, Check, Act (PDCA) cycle be visited?

Each stage should be carried out once in the order Plan-Do-Check-Act
There should be a single Plan, then the Do-Check-Act cycle should be repeated multiple times to implement Continual Improvement
There should be a single Plan and Do, then Check and Act should be carried out multiple times to implement Continual Improvement
The entire cycle should be repeated multiple times to implement Continual Improvement