Free Solo Climber, Alex Honnold Honnold is the man who climbed El Capitan without ropes. In this National Geographic article we learn that the climber "is an inveterate note-taker, logging his workouts and evaluating his performance on every climb in a detailed journal."
Free soloing on On El Capitan.
Boston Red Star J.D. Martinez
Martinez in the dugout taking notes on his at-bat.
Martinez led the 2018 World Champions in homeruns, RBIs, and hits, and has kept notes on his performances for years.