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Muscle strength exercisers designed to provide resistance to muscular contraction of the lower limbs using 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. These exercisers are used to exercise the lower-limb (e.g., squat, lunge, leg press, leg extension, heel raise) muscles. Lower-limb pneumatic strength exercisers are intended to improve muscle strength in the lower limbs (e.g., buttock, thigh, calf, ankle); increase muscle size, endurance, and power; and improve bone density. Dedicated lower-limb strength exercisers are available for leg extension, leg press, and leg curl.
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