Use a compound exercise first, then finish the target muscle with isolation work.
Good for hypertrophy finishers when the client still has safe control.
Use the method to improve the result, not just to make the workout harder. The client must still move well, recover well, and understand the purpose.
Leg press 8-10, then leg extension 12-15.
Month 1: learn the format and keep effort controlled. Month 2: add a set, round, or slightly more load. Month 3: increase intensity only if form, recovery, and confidence are strong.