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  • Muscle strength exercisers designed to provide resistance to muscular contraction when the knees are flexed against the resistance provided by equipment based on a pneumatic mechanism. These exercisers usually consist of a stand-alone machine including 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. Lever bar machines require the users to push a padded lever bar down with their ankles to flex their knees toward the back of their thighs or lie prone and, with the pads above the ankles, flex the knees toward the back of their thighs. Leg curl pneumatic exercisers are intended to improve strength in the hamstring muscles, increase muscle size, enhance muscle endurance and power, and improve bone density.
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