The average person weighs 60 kilograms. When holding the chest with a straight arm, it will be longer and heavier than the resistance arm when pushing on the bench. Holding the chest with straight arms is a standard exercise for fitness. The main exercise part of sitting straight arm holding chest is pectoralis major, which makes pectoralis major more developed. When exercising, keep your arms as straight as possible, tighten your abdomen and keep your shoulders straight.