Mark "Flex" Alexander Knox (born April 15, 1970) is an American actor and comedian.

Early life

Born in New York City in Harlem, Alexander is the son of Alethia Knox and Robert Whitehead.
As a teen, he began dancing in New York clubs earning the nickname "Flex" due to his acrobatic dance skills. After being discovered by DJ Spinderella, he began touring with rap trio Salt-n-Pepa's dance troupe for three years. In addition to dancing, Alexander also choreographed for Mary J. Blige and Queen Latifah. In 1989, he made his stand-up comedy debut and eventually turned to acting, making his film debut in a bit part in the 1992 film Juice.