There are ordinary hard pull, sumo hard pull and high hard pull. I don't know what you do. When pulling hard, there are many places in the body, including gluteus maximus, biceps femoris, quadriceps femoris and so on. If you are holding your ass hard while pulling, it must be a big feeling on your ass. Since you want to practice your back, that is, erector spinae, please pay attention to your posture when you pull hard. First, toes forward. Then hold the barbell with both hands, then tilt your ass, straighten your back and look up. At this time, your back and butt are in a line, then keep your legs still and pull the barbell up with the strength of your upper body. If you feel heavy, change to a lighter one. Find the feeling first. Hard pulling is easy to get hurt. Be attentive and careful when practicing!