I love swimming simply because of how it makes me feel.
First of all there's the way the water feels. Clean and fresh and not dusty or sweaty. And then there's the floating. As an over sized elderly woman who has never been even close to graceful or athletic in any way, there is nothing more wonderful than floating in water. You are, in an instant, as graceful and weightless as any size 0 dancer.
Swimming makes me feel accomplished and competent. I'm not the fast swimmer nor do I have the best technique but I can swim long and far and I do every day. I swim first thing in the morning and it makes the whole rest of the day good. I can sit on my ass and do nothing all damn day long and it's fine because I will have already swam a mile.
I think I like swimming best of all.