The Eyeline Exa Cord Swim Belt is the perfect solution for getting a great workout in your back yard pool. You'll be able to swim uninterrupted and get all the benefits of lap swimming while staying in a fixed stationary position. How to Use: Make a slipknot with webbed loop strap around secure point ie: permanent attached pool ladder, lane line grommet or pool fence. Attach at a height so the stretch rubber cord does not rub on edge of pool.