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Flex Alexander is an American actor, dancer and choreographer best known for his roles in the films Juice and Snakes on a Plane.

Mark Alexander Knox was born April 15, 1970, in New York City. Alexander, the son of Alethia Knox and Robert Whitehead, had a troubled adolescence, and has recalled getting into fights, selling drugs and carrying a gun at the age of 15.

Alexander began dancing in New York clubs during his teen years. His energetic dancing style earned him the nickname "Flex" and attracted the attention of DJ Spinderella. When Spinderella began touring with the trio Salt-n-Pepa, Alexander joined the tour for a period of three years. Alexander also choreographed dance routines for performers, including Mary J. Blige and Queen Latifah.

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