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Free weight exercisers designed to provide resistance to muscular contraction. These devices are long bars with removable weighted disks attached to each end. Using the weight on the barbells, resistance is provided by the force of gravity acting on the barbell. Barbells are not attached to any other devices and do not restrict a user\'s movements. Barbells can be used in exercises to train the upper limb/trunk (e.g., bench press, bicep curl, abdominal curls) or lower limb (e.g., squat, lunge) muscles. Barbell exercisers are intended to improve muscle strength in the upper limbs, trunk, and lower limbs; increase muscle size, muscle endurance, and power; and improve bone density.
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