Final answer:
The process of adjusting the intensity of an activity for maximum client performance is known as grading. It begins with low intensity activities and progresses to moderate and then high intensity programs as the individual's abilities improve.
Step-by-step explanation:
The process of modifying an activity for a client's maximum performance is called grading. This process involves adjusting the difficulty or intensity of an activity to match the client's current level of ability, with the goal of improving their performance incrementally. For example, in physical therapy or exercise programs, grading may start with low intensity or skill based activities, then progress to a moderate exercise program, which could entail about 1 hour per day of exercise, and might eventually evolve into an endurance program with 1-3 hours per day of moderate to high intensity exercise. Grading helps ensure that the individual continuously improves while avoiding overexertion or injury.