Coach Morg takes the POWERBREATHER down to the Blue Lagoon to test in open water. He has already tested in the pool.
One of the major uses highlighted by Coach Morg is how during front crawl training the POWERBREATHER can help develop and tune stroke without getting distracted by breathing. He also highlights how you can give your lungs a bit of a work out thanks to the resistance offered by the POWERBREATHER. You can make this more obvious with the blanking cap.
The model used in this video is the POWERBREATHER Wave Edition.