The swimming , beyond being an excellent aerobic exercise, which helps you burn fat and tone every muscle in your body, it is an art. According to the magazine Sport Life, the basic advice that coaches give to improve your technique is: The finger.
The explanation is that during the phase area of the crawl stroke, called "recovery", you have to bring your hand so that the fingers move only touching the surface of the water.
Apparently this simple advice facilitates the placement of the elbow very high and forces you to tilt the body, which allows you to make the entire turn correctly. In this way, you will improve your swimming technique and that will allow you to optimize your performance underwater.