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Muscle strength exercisers designed to provide resistance to muscular contraction in the trunk 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. Pneumatic trunk muscle strength exercisers can be used to exercise the trunk (e.g., hip rotation, low back, abdominal crunch) muscles.
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