By keeping its laws and customs, and by preparing for it beforehand: showering, clean clothes, cleaning the house, preparing the customary foods, setting the table, inviting guests.
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They prepare their children for Shabbat and light the Shabbat candles.
"Shabbat Shalom!"
They're called Shabbat candles (Neirot Shabbat in Hebrew).
in your own home, your own society and in your own lifestyle.
Shabbat Shalom (שבת שלום).Note: This means 'A peaceful shabbat'. The phrase "happy shabbat" is not a phrase that is traditionally used.
Shabbat shalom is a Jewish greeting which we say during the day of Shabbat. See also:More about the Jewish Shabbat
Shabbat comes from the Hebrew word for sit/rest. Shabbat is the day of rest.
Shabbat Shabbatot
After Shabbat, there is the Havdalah service.
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There is no issue with swimming during Shabbat, however, you wouldn't be able to shower after swimming until Shabbat ends. (Assuming you wish to be Shabbat observant.)