Related Clues:

• Started a triathlon
• Took to the pool
• Crossed a lake, in a way
• Made like Leander
• Did the crawl
• Emulated Spitz
• Did laps, maybe
• Crossed the Channel, a la Ederle
• Enjoyed the pool
• Did laps in the pool
• Used the pool
• Did laps, perhaps
• Took a dip
• What Ian Thorpe did
• Did one leg of an Ironman competition