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Underwater movies?! Video technology allows aquatic video footage to be recorded, which can then be analyzed at a later time for further improvement. Underwater cameras (in combination with above water cameras) record your individual style so that improvements can be made. Obviously, the most accessible type of pool to due this type of filming in is a lap pool.
*Using a counter-current swimming pool allows you to stay in one place, making it easier to film, and easier to improve.