The Hatfield squat targets the quadriceps, femoris, and glute muscles and is especially popular for weightlifters that have strong backs but weaker legs.
The Hatfield squat is one of two alternatives for hack squats on this list that uses a safety bar. It forces the torso to remain vertical while giving the glutes and quads an intense workout. It's an ideal exercise for lifters suffering from or recovering from a back injury or who want to build strength and improve squat form.
Before attempting the Hatfield squat, take time to learn the barbell back squat first. It will help make doing this variation a bit easier. Also, don't resign yourself to the hand supports on the machine. Instead, try out different supports to find which works best for you.
One mistake athletes make while doing the Hatfield squat is hand positioning on the bar. Make sure your hands are evenly spaced and that you have the proper grip.
This hack squat alternative has no variations to mention. However, you can use the barbell back squat as an alternative if you find this exercise too difficult.