The leg press hack squat machine is a piece of gym equipment that combines the leg press and hack squat exercises into one machine. It typically consists of a large platform where the user can place their feet and a backrest for support. To use the leg press hack squat machine, follow these steps: 1. Adjust the seat height: Start by adjusting the seat height so that your feet can comfortably reach the platform. 2. Select the desired weight: Load the weight plates onto the machine according to your desired resistance level. Make sure to evenly distribute the weight on both sides. 3. Position yourself on the machine: Sit on the machine with your back against the backrest and your feet flat on the platform. Your knees should be bent at a 90-degree angle. 4. Choose the exercise: Depending on the machine, you can either perform a leg press or a hack squat. Some machines have a lever or switch that allows you to switch between the two exercises, while others may require you to adjust the foot placement.