For medical reasons a person needed to go swimming as part of his therapy for a bad back. He asked Rav Shlomo Zalman Auerbach if he may do so before davening. Rav Shlomo Zalman asked him if after going swimming he would still daven BaZman. The person answered that he would daven at a 7 am minyan, to which Rav Shlomo Zalman confirmed that 7 am is BaZman.
The questioner then explained that he could go swimming later during the day but it would come at the expense of his learning schedule. RavShlomo Zalman said that in that case he may swim before davening. (Aleihu Lo Yibol OC 66) Revach

whats the hava aminah that swimming before davening was a problem? Especially since that questioner admitted that he would daven after swimming at 7AM????????????
because u r not supposed to do personal things before davening – there is a special heter to start getting Shabbos supplies before davening on Friday
number 1 please dont show us how little you know. at least learn the halachos before posting a question like that. even to travel to ny by bus or driving before davening is questionable and must be addressed
lol michael phelps
just dont swim after you eat.