A recruit from Papa Company 189 treads water for 5 minutes during her swim assessment at Training Center Cape May, N.J., April 3, 2014. (Chief Warrant Officer Donnie Brzuska/U.S. Coast Guard photo) ...

U.S. Marine Corps Lance Cpl. Ben Putnam, a rifleman with 1st Battalion, 3d Marines, conducts the 1,400-meter swim event during the 3d Marine Division Squad Competition on Camp Schwab, Okinawa, Japan, ...

Unless you're a water-polo player, the "egg-beater" technique may mean little to you. But new research from the University of Otago has found it may be the most effective skill you can learn to ...