Munich, Salzburg, and/or Nuremburg

Does anyone have suggestions for the above cities? I found the previous discussions of Munich but the Olympic pool is closed for construction. Pool or OW suggestions are much appreciated. Munich appears to have some pretty impressive pool options, so I’m guessing there is a pretty strong swimming community:
Comments
Lake Constance/Konstanz is gorgeous, though it may be chilly. I think if you do a search on it, there are some threads about it. It's on the SE corner of Germany
https://www.swm.de/english/m-baeder/outdoor-pools/dante-freibad.html