Swimming is not a sport that requires extreme flexibility, like gymnastics or figure skating. Flexibility is a good skill to have, however, when you get to a higher level that demands vigorous training, much like every other sport. Flexibility helps in injury prevention, creates leaner muscles, and aids in performing good technique.
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No, because gravity feels like nothing in water and has very little effect on you.
Mainly so you can float but also so you don't get swimmers ear or imbalanced pressure when you got to low depths of 12 or 13 feet.