Longman Dictionary of Contemporary English
Wiktionary
n. (context weightlifting English) A form of physical exercise using weights to increase the strength and size of muscles by using exercises specific for each muscle group.
Wikipedia
Weight training is a common type of strength training for developing the strength and size of skeletal muscles. It utilizes the force of gravity in the form of weighted bars, dumbbells or weight stacks in order to oppose the force generated by muscle through concentric or eccentric contraction. Weight training uses a variety of specialized equipment to target specific muscle groups and types of movement.
Sports where strength training is central are bodybuilding, weightlifting, powerlifting, and strongman, Highland games, shotput, discus throw, and javelin throw. Many other sports use strength training as part of their training regimen, notably; mixed martial arts, American football, wrestling, rugby football, track and field, rowing, lacrosse, basketball, baseball and hockey. Strength training for other sports and physical activities is becoming increasingly popular.