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How to flutter kick
Hold onto a pool wall or lane marker.
Grasp a wall of the pool, a lane marker, or another stationary object that allows you to extend your body in the water behind it. Hold your arms out straight from the wall, with the rest of your body as horizontal as possible in the water.
Ideally, have your face submerged in the water so that your head is in the same line as your body. Obtain a snorkeling mask to make it easier to maintain this position without having to bring your face up for air.