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  • Muscle strength exercisers designed to provide resistance to muscular contraction in the neck using a mechanism based on a system of pulleys and cables or levers; resistance is usually provided by the force of gravity exerted on constrained weight stacks. These exercisers usually consist of a stand-alone machine with weights stacked on top of each other, 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 put padded lever bars on their heads or wear the cables to flex their necks against the resistance. Neck strength exercisers are intended to improve muscle strength in the neck, increase muscle size, enhance muscle endurance and power, and improve bone density.
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