 Schulz returned to coaching in 1913 as the line coach and chief assistant coach for Fielding H. Yost at Michigan . He held that position for three seasons from 1913 – 1915 . While working as an assistant coach at Michigan , Schulz has been credited with introducing the technique of <unk> a lineman on defense . In 1913 , Schulz developed a new blocking technique by shifting one of the linemen . Coach Yost was unconvinced until Schulz performed a demonstration using Michigan 's left guard Royce Traphagen . Schulz first put Traphagen in the line position designated by Yost , Schulz lined up on the other side of the line and charged , " almost wrecking Traphagen " . Then , Schulz had the groggy Traphagen line up in the spot designated by Schulz , and when Schulz charged he missed . Schulz implemented the <unk> technique during the 1913 season . 
