Michigan coach Bo Schembechler poses during a 1981 SI photo.
Argentina's San Lorenzo coach Uruguay's Diego Aguirre gestures during their 2017 Copa Libertadores football match against Ecuador's Emelec at George Capwell stadium in Guayaquil, Ecuador, on July 6, 2017. /
Bayern Munich's Spanish head coach Pep Guardiola gestures from the sideline during the UEFA Champions League second leg quarter finals football match SL Benfica vs FC Bayern Munich at the Luz stadium in Lisbon on April 13, 2016. / AFP / FRANCISCO LEONG - 28 of 272