I'm at summer camp and the best thing to do is go swimming. 
That sounds like fun, I love swimming personally, great exercise and it feels great.
Me and the other campers lay games to keep pool time fun. 
Are one of those games Marco Polo?
Sometimes. We play that game when we get tired of swimming so fast in the other games. 
Yes, swimming is very tiring. Many athletes use swimming as a form of exercise because it uses more energy underwater.
Swimming (sport)
Swimming is an individual or team sport that requires the use of one's entire body to move through water. The sport takes place in pools or open water (e.g., in a sea or lake). Competitive swimming is one of the most popular Olympic sports, with varied distance events in butterfly, backstroke, breaststroke, freestyle, and individual medley. In addition to these individual events, four swimmers can take part in either a freestyle or medley relay. A medley relay consists of four swimmers
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