Cpl. Stephen Dillon, the base commander’s driver, executes a set of pushups, one of many simple exercises recommended for indoor physical training, at Lejeune Hall on Dec. 17, 2013. - Cpl. Stephen Dillon, the base commander’s driver, executes a set of pushups, one of many simple exercises recommended for indoor physical training, at Lejeune Hall on Dec. 17, 2013.