Someone told me that if a person did not swim prior to the three weeks, he may not start swimming during the three weeks? Is there a source for this? (sources)
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Although people say that one may not go swimming for the first time during the Three Weeks, there is no halachic source for this practice. It is therefore not considered a binding custom and it is permitted without Hataras Nedorim (Piskei Teshuvos 551:46).
One may swim during the three weeks, but not after Rosh Chodesh Av. Some however have a custom not to go swimming during the three weeks at all.
It sounds like those who allow one to "Continue swimming" is a subset of those who don't swim during the 3 weeks, but it is not the normal custom.