Swimming is considered a low-impact sport.
I have heard of that! Is it true it's best for your joints?
I would imagine so.  In some countries, lessons are even part of a student's education.
That's so interesting. My school never had a team or any physical education required by swimming, I think that would be a really good idea.
I agree.  As it relies on the natural buoyancy of the body, everyone should be able to do it.