Swimming coach Denny Pursley, who schools teen-age world record holder Mary Meagher: "If there's a sport more demanding as far as hours and effort expended are concerned, I'd like to know what it is. You train 10 miles a day, five hours a day in the water, plus working with weights, year round.It takes four times longer to swim 10 miles than it does to run 10 miles. It's the most boring sport to train for. You can't see anything, you can't hear anything, and it's monotonous. If you're a runner, you can at least enjoy the scenery and listen to the birds."