The grip width should be set so that when the bar is lowered to the lips, the elbows form a 90-degree angle. Before starting, sit down with your feet under your body, standing on your toes and pressing down firmly on the ground while holding the bar, and start from above. Do not bend your wrists too much; just slightly bend them back from a vertical position. If you bend them too much, your wrists will hurt when lowering. Slightly bend your wrists, take a breath to stabilize your abdominal pressure, rotate your thoracic spine, and slightly extend only the rear shoulders while pushing your upper abdomen forward. At this time, your lower back should not lean back. Maintain that position while lowering; when the bar comes down to your lips, keep the same posture and raise the bar. When it passes your forehead, return your thoracic spine to neutral and lift it all the way up. After lifting, do not raise it to the point where your shoulders hunch. Before starting again, stabilize your abdominal pressure and repeat the same process.