CIRCA 1970's: Running back Calvin Hill #35 of the Dallas Cowboys during pre game warm-up before a circa 1970's NFL game. Hill played for the Cowboys from 1969-75. (Photo by Focus on Sport/Getty Images)
CIRCA 1970's: Running back Calvin Hill #35 of the Dallas Cowboys during pre game warm-up before a circa 1970's NFL game. Hill played for the Cowboys from 1969-75. (Photo by Focus on Sport/Getty Images)