A few years' ago, a New Zealand university did a study about swimming. I guess that a grant was involved. Obviously there would be a lot of writing down of equations, testing of volunteers, and a myriad of budding scientists wearing spectacles and lab coats. The study, naturally, would take several months, if not longer, to complete. There would be a thesis or two at the end, and a good grade from the teacher.
The discovered outcome? ... it takes two minutes for swimmers to overcome the initial coldness of the water after they've first jumped in.
Two minutes to get used to the cold water? Goodness, my swimming friend, J, and I could have told that to the university boffins years ago.
The secret of swimming enjoyment, whether in pool or sea, is to grit your teeth and not flail out for shore within seconds of getting into the water.
However, it's now official. Wait out that two minutes ...