Was in Greece swimming in very salty buoyant water for a month with my wife and 4 and 7 year olds. Took a Catamaran one day and swam through deep water caves with them, daughters with swim vests (fabric with foam). We swam like that for a month, and then the last night before flying back, we swam in our hotel pool. My 7 year old was doing the backstroke (no swim vest) across a long deep fresh water pool when she bumped into someone, turned, panicked, bobbed up and down, went under. I dove in and grabbed her and struggled to swim back. I'm 45 and although not in great shape, I do regularly exercise. Shocking to see I can't swim now like I used to. Once pulled my wife away from a current taking us out quickly in Cancun. That was 15 years ago. If the same thing happened now, I'd drown.