Despite his diminutive physique – he stood as an adult – McMahon did achieve some success as an athlete. He won his university's lightweight boxing title, and in his final year at Sydney Grammar rowed in the Head of the River race.
Despite his diminutive physique – he stood as an adult – McMahon did achieve some success as an athlete. He won his university's lightweight boxing title, and in his final year at Sydney Grammar rowed in the Head of the River race.