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Muscle (from Latin musculus, diminutive of mus "mouse") is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh.

There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.

Michael "Mike" Robert Chang, Jr. is a fictional character from the Fox musical comedy-drama series Glee. The character is portrayed by actor and dancer Harry Shum, Jr., and has appeared on Glee since the fourth episode in the first season, "Preggers", first broadcast on September 23, 2009. Glee follows the trials of the New Directions glee club at the fictional William McKinley High School in the town of Lima, Ohio, of which Mike is a member. He is introduced as a football player who joins the club together with a few of his teammates, and quickly shows himself to be an excellent dancer.

Mike is played by Harry Shum, Jr. He has also been portrayed as a very young boy by Evan Kishiyama in the episode "The Substitute". When Shum was hired, he had been through the audition process, but as far as he knew "it was just like a regular acting gig where you go on for a day." In an interview with the New York Post, he elaborated, "I got hired as a day player and it turned into a week, and then a month and so on. I was just rolling with it—I mean, who would say no to that?"