Which are updated?】1. We added a removable calf raise station for the leg press hack squat machine, which provides you the opportunity for more versatile exercises. 2. We updated the weight carriages fit both 1” and 2” weight plates. You can put any weights you want on the machine. 【Leg Press Hack Squat Combo】This machine can be easily changed between leg press and hack squat machine by adjusting the removable backrest. There are 3 different angles for leg press and 5 angles for hack squat exercise, which provide very comfortable exercise choices for all family members at different heights. 【Safety and Stability】DONOW leg press and hack squat machine is adapted SOLID linear bearings rather than rolling ones, which provides you more smooth and sable workout experience.