Weight training is a common type of strength training. It uses the force of gravity in the form of weighted bars, dumbbells or weight stacks to oppose the force generated by muscles. Weight training uses a variety of specialized equipment to target specific muscle groups and types of movement. Weight training strengthens bones, helping to prevent bone loss and osteoporosis. By increasing muscular strength and improving balance, weight training can reduce falls by elderly persons as well .
Although weight training is similar to bodybuilding, they have different objectives. Bodybuilders use weight training to improve their body image by developing their muscles for size, shape, and symmetry regardless of any increase in strength for competition in bodybuilding contests; they train to maximize their muscular size and develop extremely low levels of body fat. In contrast, many weight trainers train to improve their strength and anaerobic endurance while not giving special attention to reducing body fat far below normal.
Weight training is a safe form of exercise when the movements are slow, controlled, and carefully defined. However, as with any form of exercise, improper execution and the failure to take appropriate precautions can result in injury.