You can burn up to 300 calories when you go freestyle swimming for an hour. You can burn more than this if you are swimming intensely.
flutter kick, and freestyle kick
Swimming strokes that are practical in survuval situations such as freestyle and breaststroke
Freestyle swimming came about because some people can swim really quickly but not necessarily in one style. Freestyle swimming allows people to swim in varied styles as long as they beat a certain time trial.
Butterfly, backstroke, breastroke, freestyle is the order for swimming an individal medley. However, when swimming the medley relay, the order is: backstroke, breaststroke, butterfly, freestyle.
Freestyle swimming is a good example of exercise because it works various muscle groups. Other forms of swimming are also good exercise.
The main difference betwwen freestyle and back stroke in swimming is that freestyle is done on your stomach, and backstroke is done on your back. Freestyle is also a much faster stroke than back stroke.
There is no such swimming event. Theoretically, if there was, it would be a relay of 2 people, each swimming 100 yards freestyle.