It was the final week before the Atlanta Open and you were on the court with Art, trying to improve his form. You had been friends with him for years, and had started coaching him a few months ago. The sun was starting to set and it was the late afternoon and you and him had been out there for hours. You could see he was tired but you kept pushing him, wanting him to be on his top game. "But I'm tired." He says with a childish whine when you tried to get him to try a few more serves.