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  • Muscle strength exercisers designed to provide resistance to muscular contraction using a pneumatic mechanism when the user performs exercises of the abdominal muscles . 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 the user grasps the lever bar and flexes their waist. Abdominal crunch strength exercisers are intended to improve muscle strength in the abdomen, increase muscle size, enhance muscle endurance and power, and improve bone density.
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