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"Redheffer was a physical fitness buff and an avid hiker. Over the years he accumulated a list of over 350 named peaks that he climbed, including Popocatepetl, and he was a member of the Hundred Peaks Section of the Sierra Club. Redheffer was physically strong, he worked out regularly at the gym, and he could perform, for instance, a flag, which consisted in supporting his body horizontally with his hands on a vertical bar. He enlivened his large lectures by performing one-armed pushups and back planches to illustrate mathematical concepts to his calculus students. He installed a pull-up bar at his office doorway, to engage and challenge his students at office hours."[1]
