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UFC heavyweight champion Cain Velasquez (9-0) talks how wrestling helped his football development and, conversely, which skills transferred from the gridiron to the mat.

John Brenkus of Sport Science analyzes what makes wrestlers so effective in the Ocatagon. Cain Velasquez and Brock Lesnar, competitors at UFC 121 in Anaheim, Calif., were both decorated NCAA wrestlers at Arizona State and Minnesota, respectively.