
In response to a question if a woman may swim in a public area that is enclosed and reserved for women but in the presence of a male lifeguard Rav Moshe Feinstein answered that according to the basic halachah it’s permitted to do so. After rendering his ruling Rav Feinstein added that although halachically permitted it’s recommended for G-d-fearing women and the wives of Torah scholars (who are supposed to display a greater sensitivity to tzniyus) to avoid swimming in the presence of a male lifeguard. While Rav Moshe does not distinguish between different types of bathing suits it’s clearly halachically preferable for a woman who swims in the presence of a male lifeguard to be covered as much as she can be.
The Gemara quotes a minority opinion that it’s an “obligation” for a father to teach his son how to swim in a river. While there’s no Torah source for this obligation it was intended to be a practical life-saving measure for boat passengers who may find themselves in a sinking boat; the ability to swim will afford a greater chance of survival. Since neither Rambam nor Shulchan Aruch codify this advisory as halachah it’s not considered a halachic obligation or a mitzvah but still remains a good idea.
From a halachic perspective they may wear regular bathing suits. Swimming in an enclosed place designated for women only is similar to swimming or bathing in one’s own home and is not considered pritzus. In actual practice however it will depend on the community custom. Many communities have set various standards for tzniyus for women in a public women-only venue and the women of those communities are obligated to follow those standards.
Upon seeing a great body of water created by Hashem during the Six Days of Creation (unlike the Dead Sea which evolved later) and which causes one to be amazed by its great size e. g. the Mediterranean Sea or awesome power e. g. Niagara Falls the proper blessing is Oseh maasei bereishis. When sighting the Atlantic or Pacific Oceans many poskim rule that the blessing of Oseh hayam hagadol be recited while others recite Oseh maasei bereishis here as well. Either way the blessing should only be recited once every 30 days over any one particular body of water.
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