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Muscle strength exercisers designed to provide resistance to muscular contraction when the knees are flexed against resistance using equipment 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. 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; using pulley-cable machines, the users attach the cable to their ankles and flex the knees. Leg curl 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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