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  • Trunk exercisers designed to provide resistance to muscular contraction using a pneumatic mechanism when the user performs low-back muscle exercises. These exercisers are usually 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 sits on a exercise chair and actions appropriate pedal levers. Lower back exercisers are intended to improve muscle strength in the lower back muscles (especially the extensor muscles) and ligaments, increase muscle size, and enhance muscle endurance and power.
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