I think swimming seems so relaxing and enjoyable. I'm not good at it though.
i really love swimming in the ocean!
It's funny how locomotion is achieved through the coordinated movements of the limbs.
i've never thought of it this way :) I wonder if swimming burns more calories than running
It is one of the top recreational activities and in some countries lessons are mandatory in school curriculums. 
how cool is that! Do you know in what schools swimming lessons are mandatory?
Not sure. But I think higher levels of body fat and saltier water lower the density of the body and increase bouyancy.
that's interesting! What other cool facts do you know?
Just I like how low impact it is compared to land activities like running.
yes, and running is so boring! swimming is more fun