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Resistance training , also known as weight training, relates to any exercise which results in the muscles contracting against an external resistance. Those undertaking resistance training programs do so with the expectation of increasing mass, strength, and/or endurance. Resistance training works by causing microscopic tears in the muscle. These small tears are then repaired in a process known as muscle protein synthesis, which leads to muscle hypertrophy. Catabolism is the state in which the muscle is broken down by your body (muscular atrophy). Resistance training can help to avoid catabolism of muscle, but the individual will still need to consume adequate amounts of protein to outweigh breakdown. Anabolism is the opposite of catabolism and refers to a state of muscle growth (hypertrophy).