Science of the Summer Games: “Underwaters” technique gives Olympians an edge

Swimming will be one of the most anticipated sports at the Summer Olympics in Paris. This year, pay attention to the “underwaters.”
University of Delaware adjunct professor George Edelman has been on the medical staff for USA Swimming for 24 years, working directly with Olympic athletes and in various additional capacities including research, recovery and injury prevention. He explains how underwater swimming, a technique popularized by Michael Phelps - the most decorated Olympian of all time,
with 28 medals, including 23 gold Olympic medals - will be the maneuver to watch.

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Almost like they've been around since the 90s 😅...