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.
local, national, and international competitions, including every modern Summer Olympics.
Science.
Swimming relies on the nearly neutral buoyancy of the human body. On average, the body has a relative density of 0.98 compared to water, which causes the body to float. However, buoyancy varies on the basis of body composition, lung inflation, and the salinity of the water. Higher levels of body fat and saltier water both lower the relative density of the body and increase its buoyancy.
Since the human body is
hours at a time sporadically sometimes resulted in her feeling that she is not "100 per cent involved with it ... at the same time, that character is so my character. I feel very possessive of Fiona. It's interesting to see something that's not actually tangible so fully embody your essence. It feels like I've lent something to this film that I could never give to any other film, in a weird way." Diaz would often defend Fiona's appearance from interviewers asking how she feels playing an "