After Squats move onto one of these Leg Machines to Burn what Muscle Fibers are left! Hip Sleds are the Standard in Building Lower Body Strength. Quads are targeted better with Leg Presses and Placing feet under Hips during Hack Squats Works the “Hard to Hit” Biceps Femoris. A Bad Back is No Problem Do Squats minus the Spinal Compression and Knee Stress with a Vertical Leg Press. FREE Shipping in the Contiguous United States.