Breaststroke

The breaststroke is a swimming style in which the swimmer is on his or her chest and the torso does not rotate. It is the most popular recreational style due to its stability and the ability to keep the head out of the water a large portion of the time. In most swimming classes, beginners learn either the breaststroke or the front crawl first. Since the breaststroke can be swum with the eyes almost always above water, it is important in lifesaving, as it allows the rescuer to approach the victim without losing sight of them. However, in competitive swimming, the breaststroke is regarded as one of the most difficult strokes, requiring comparable endurance and leg strength to other strokes. Some people refer to breaststroke as the "frog" stroke, for your body moves like a frog swimming in the water. The stroke itself is the slowest of any competitive strokes and thought to be the oldest of all swimming strokes.

Read more about Breaststroke:  Speed and Ergonomics, History, Technique, Competitions, FINA Rules