Why? Courtney was an innovative rowing theorist, developing a new and very successful rowing style, and took an unusually puritanical line on fitness. He never drank nor smoked himself and in his later extremely successful career as a coach insisted on his crews abstaining also. On one occasion he sacked most of a crew for eating strawberry shortcake before a regatta, going on to win with a mainly substitute crew made of sterner moral fibre.
But what really endears Charles Courtney to me is a story I found in his entry in Wikipedia:
At 12, Courtney built his first boat out of hemlock boards and two inch planks that he had found. Due to his poor workmanship he plastered yellow clay on his boat to keep it water-tight. Once on the water the clay would eventually be washed away. This did not stop him and his friends from racing the boat. They would take turns to see who row it the farthest before it sank.