texts: topic: Swimming  <s> Buoyancy causes the body to float. </s> <s> I see!  Is swimming good for exercise? </s> <s> Yes it is. And it's better on the body then some other exercises, since it is considered low-impact. 
labels: That is good to know since I have bad knees!  I heard that babies can be born in water and are able to swim!  Is that true?