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Weight training is a common type of strength training for developing the strength and size of skeletal muscles. It uses the force of gravity in the form of weighted bars, dumbbells, or weight stacks, to oppose the force generated through concentric or eccentric contracion. Weight training uses a variety of specialized equipment to target specific muscle groups and types of movement.

Weight training differs from bodybuilding, Olympic weight lifting, powerlifting, and strongman, which are all sports rather than forms of exercise. Weight training, however, is often a part of the athlete's training regimen.

Source: wikipedia.org
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