Selectorized strength equipment has been a mainstay in gyms for decades. The reasons are clear; they work and they are easy to use.
Single or dual selectorized exercise equipment focuses on one or two muscle groups per machine. They allow users to lift weights from a comfortable seated position and to adjust the weight easily and move on to another station. This is why they are great at commercial gyms and resort fitness rooms.
They use cams and pulleys for the amount of resistance that the user wants. Selectorized machines target and strengthen particular muscles to their fullest.
When using them the fixed movement pattern helps you to isolate a muscle group for a more thorough workout. These machines are great for both beginners who want to see results fast and for the pros.