Swimming is one of my favorite hobbies. It's when you self propel through water.
I love to swim, but I don't know any of the proper swimming strokes.  How many swimming strokes are there?
Competitive swimming includes the butterfly stroke, freestyle stroke, breastroke, and individual medley.
Do they have swimming like that in the Olympics?
Yes it is one of the most popular Olympic sports.
Do they have swimming competitions other than the Olympics?
Yes but I"m not sure what they are called.
Who are some of the best Olympic swimmers?
Kim Vandenberg is one. She won a gold medal in the 2011 Pan American Games in Guadalajara.