More targeted workout than free standing squats When going through the full range of motion, the hack squat tends to work more of the vastus medialis and lateralis muscles (those around the knees). The regular free weight squat tends to develop more of the inner and outer muscles as you must use these for stabilization. Dimensions - (L x W x H) 225.3 x 97.5 x 147.5cm Weight - 157kg SPECIFICATION: Brand Impulse Usage Home Use, Commercial Use Condition Brand New Warranty Lifetime - Frame, 2 Years - Rotary bearings, weight stacks, pulleys, guide rods and structural moving parts. 1 Year - Cables, linear bearings and springs, 6 Months - Hand Grips and all other parts, 1 Year - Labour