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The bench press is a flat bench with two arms on the side that carry the barbell for chest exercises. The proper use of the bench press is to lift the barbell upward and lower it to the area of your nipples. The athletes are must not be perpendicular to the torso, but angled to 45 degrees to prevent shoulder impingement. There are multiple versions of the bench press such ass inclined bench press and the decline bench press,  which both functions differ based on the angle it is being used. The movements of the bench press is to contract the pectoral muscles with the movement of lowering and raising the barbell. The tricep is also contracted during the movement because it's a compound movement. The flat bench press contracts the pectoralis major while the incline contracts the pectoral minor, the upper chest muscle. A polish study showed the movement of both a powerlifter and body builder by testing them after a ten minute warm up. The research showed that it depends on how much weight the athlete loads onto the bar, the exercise will affect the body differently. The bench press exercise worked the power lifter's triceps brachii  muscle and the body builder worked his anterior deltoid and pectoralis major. In another research,  it was shown that the flat bench press can increase the velocity and power of the chest muscles. Adding free weight onto the barbell increases the power of the movement and increases the strength of the athlete.