Swimming movements, or strokes, are the various ways of propelling oneself through the water. Common strokes include the front crawl, backstroke, breaststroke, and butterfly. Each stroke has its own unique technique and is used for different purposes. The front crawl is the fastest stroke and is used for speed and endurance, while the backstroke is used for leisurely swimming. The breaststroke is a slower stroke that is used for recovery and the butterfly is the most difficult stroke and is used for power and strength.