Youmans attended North Syracuse High School, where he initially focused on playing basketball and averaged 20 points a game.
As a senior, he became part of a defensive/offensive line known as the "sizeable seven" that also included Bob Yates, Fred Mautino, Al Bemiller, Roger Davis, Bruce Tarbox and Gerry Skonieczki.
As a rookie, he played left defensive end and his bookend partner was future hall of famer Doug Atkins, but missed games with a dislocated shoulder.
The next year, he requested a trade thinking he was going to the Green Bay Packers, but instead was sent to the Dallas Cowboys in exchange for offensive end Gary Barnes on June 18, 1964.
A knee operation didn't allow him to participate in the New York Giants training camp and was released on September 6, 1966.