The average person can swim about three miles per hour. Swimming is an amazing cardio exercise for weight loss, as up to 600 calories can be burned per hour.
Humans are naturally able to swim and can achieve high speeds in water. New equipment like bodysuits and fins enable humans to swim faster. However, there is a limit in man's quest for constantly improving swimming speed. There are four swimming styles: butterfly, backstroke, breaststroke and crawl. Crawl is the fastest swimming style and is used for all freestyle competitions. Children typically start learning to swim when they are about 6 years old.