Bench press is a chest muscle artifact. You must bench press and practice the upper part, the lower part and the lower part. If you want to develop the lower part of the pectoral muscle, you can actually develop the lower part by flattening it. If you are a novice, you can flatten it directly. Pay attention to the grip distance. When the barbell is put down, the upper and lower arms should be at 90 degrees. If the grip distance is too narrow, the triceps will be too involved and the pectoral muscles will not be able to contact.