I miss swimming, but I need a sea and an open horizon to enjoy it. And I don't have any at disposal right now. Swimming is, for me, about losing oneself far from the crowd, into this wide space that touches all the continents simultaneously. Walking around in a packed swimming pool is not quite the same, and the lake isn't quite satisfactory either.

I am the worst swimmer in the world, but I love the feel of swimming in the sea. Unluckily I live in the farthest place from the sea you can find in Spain, but I will soon put a remedy to that with my yearly vacation. :) The seas take longer to change temperature than the air. That's why there's a two-three month period of delay between air temperature and sea temperature. The sea is warmer during September than June. Ocean currents/winds may also influence; the Mediterranean, being an almost inner sea, is a lot warmer than the Atlantic.

Ocean or big lake, no. Rivers and small lakes, yes. But I don't go out of my way to go swimming. If it happens that there's the opportunity - such as at my brother's in-law's cabin - then sure.

I walk across the ocean. It's a very long summer.

https://www.youtube.com/watch?v=hk6EAfo2eyQ