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How to swim backstroke perfectly
Keep your body flat like a plank.
When you're doing the backstroke, you want your body to lay as flat on the surface of the water as possible. The smaller your profile in the water, the less resistance you'll feel as you swim and the easier it will be to go fast.
Most people have a hard time getting their hips to float on the surface of the water, so they sink down a little below the surface. This is ok but try to keep your hips as close to the surface as possible.