Also sometimes called “single station gym equipment” pin loaded machines allow you to  choose the amount of weight you want to lift by using a rod or pin to fix a stack of weights in place on a pulley. Using a pin loaded machine is an effective solution for those looking for a quality machine for targeting specific groups of muscles.
This gives you all the benefits of weight training, but frees you from needing to manually adjust the weights by loading them in yourself when you want to increase or decrease the resistance.
Pin loaded gym equipment is fantastic for a wide range of weight training styles. They can be good for those just starting out, as you can use the weights built into the machines to slowly ramp up your workouts as your strength increases. Pin loaded equipment is also popular with more experienced lifters who want to build their strength, or warm up before a heavier free weight workout.