I guess if you do not know how to swim yet, so yes You Have to Learn to Swim beforehand, but if you know how to swim then the answer is You Don't Need to Know How to Swim again unless you forget, aka You Have to Know How to Swim.
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i would suggest yes because you probaly would love it and it keeps you in so much shape try it out.
of course you do....you have to be a very good and fast swimmer, unless you are a goalie, but even then speed and technique for swimming are necessary.