If you swim really fast I think you can get the same reactions from your body, I have not tried it because I am not a fast swimmer. I love being in the water and splashing around, does that count? :) Just kidding, my idea of swimming was always connected with relaxation and slow movement, I never saw it as exercising. You do not have to worry about swimming high, you will soon have (or you have it already) a swimming body and that is way better 💚