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Muscle strength exercisers designed to provide resistance to muscular contraction in the chest using a mechanism based on a system of pulleys and cables or levers. These exercisers usually consist of a stand-alone machine with weights stacked on top of each other or a hydraulic mechanism, a system to transmit the force (i.e., to convey the resistance), and lever bars or pulley cables on which the user exerts force to counteract the exerciser resistance. Users press the lever bar or cable handles forward to extend the arms until they are horizontal. Chest press exercisers are intended to improve strength in the chest (pectoralis major), shoulder, and arm muscles; increase muscle size; enhance muscle endurance and power; and improve bone density.
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