The narrow-stance hack squat is a machine-based exercise that targets the muscles of the legs, particularly the quadriceps. It is often used as an accessory for squats, or as a muscle-building movement during lower-body training, and is usually performed for moderate to high reps, such as 8-12 reps per set or more.
Builds size and strength in the quads
Great quad burnout on leg day
Simple to alter tempo or add pauses to increase difficulty