Weightlifting is an activity that involves lifting weights in a controlled manner to achieve fitness or strength training. There are several synonyms for the word weightlifting, including powerlifting, bodybuilding, resistance training, weight training, and strength training. Powerlifting involves lifting as much weight as possible in three different lifts: the squat, bench press, and deadlift. Bodybuilding focuses on building muscle mass and definition through weightlifting, often with a focus on aesthetics. Resistance training and weight training refer to general strength training exercises that use weights as resistance. Finally, strength training encompasses all exercises that are meant to improve strength, whether it involves lifting free weights, machines, or bodyweight exercises.