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Lower-limb muscle strength exercisers designed to provide resistance to muscular contraction when the user performs hip rotations using a mechanism based on a system of levers. These exercisers are usually a stand-alone machine with weights stacked on top of each other, 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 puts one thigh in the bar pad and performs rotary movements of the hips. Hip rotation exercisers are intended to improve muscle strength in the hips, increase muscle size, enhance muscle endurance and power, and improve bone density.
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