Hack Squat Alternative Dumbbell. You can also modify your feet placement to target different muscles of the legs. Not only does this make the close stance hack squat a great leg extension alternative, it makes it great for building mobility and strength in the squatting position.

Rear foot elevated split squats. The rear foot elevated split squat, also known as the bulgarian split squat, can also serve as a replacement for the squat. Not only does this make the close stance hack squat a great leg extension alternative, it makes it great for building mobility and strength in the squatting position.