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  • Muscle strength exercisers designed to provide resistance to muscular contraction when the legs are extended against the resistance of a pneumatic mechanism. These exercisers usually consist of a stand-alone machine with a pneumatic mechanism, a system to transmit the force (i.e., to convey the resistance), and lever bars on which the user exerts force to counteract the exerciser resistance. Typically, users lift a padded lever bar with their ankles to extend the knees; less frequently, using the legs, the users pull the levers to extend their knees.
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