Weight training is a popular activity for those looking to tone and build muscle. Alternately referred to as strength training, resistance training, or weightlifting, there are many synonyms for this type of exercise. Bodybuilding is another term often used for weight training, specifically with the goal of increasing muscle mass. Other synonyms include powerlifting, which involves lifting heavy weights for a limited number of repetitions, and circuit training, which involves a series of exercises completed in sequence. Cross-training and functional training also incorporate weightlifting into a larger fitness routine focused on overall health and well-being. Whatever you call it, weight training is an effective way to improve strength, endurance, and overall fitness.