"So in my mind I own a lot of house records still"

Mark Spitz is referring to his success as a competitive swimmer. He won seven gold medals at the 1972 Summer Olympics, setting globe documents in each event. He also won a total of 9 Olympic gold medals throughout his career. By stating "So in my mind I have a lot of home documents still," he is indicating that he still holds the documents he embeded in the past. He takes pride in his achievements and thinks that he still holds the documents he set in the past. He is likewise implying that he is still an excellent swimmer, despite the fact that he is no longer competing. He boasts of his success as well as believes that he still holds the documents he embeded in the past. He is also suggesting that he is still an excellent swimmer, although he is no longer completing. He is proud of his tradition as well as is confident that his documents will certainly stand the examination of time. He is also revealing his admiration for the sport of swimming as well as the chances it has given him. He is proud of his success as well as thinks that he still holds the records he embeded in the past.