For starters, don't be afraid to be in the water. Imagine that this is not a hostile environment, and a place where you can relax. Dial a deep breath, hold your breath and lie down on the water. You won't sink all the laws of physics. People who are afraid of drowning, trying to lower the legs down to stand on them in case of danger. Overcoming your fear. Try to tread water, holding the rim with one hand. Relax yourself and imagine that you are lying on an inflatable mattress. Practice many times and succeed!
Now the next step – try to stay on the water not on the back, and in position on the abdomen. It is much more difficult and can fail. Practice, so you could lie on your stomach, while making minimal strokes by hand. If you don't learn to lie on the water without fear, then the next steps in learning will be meaningless.
Now try to achieve the correct body position during swimming. It should be noted that the swimmer is always kept parallel to the surface of the water. This is done in order to reduce the surface resistance of water. The less your body will be "pushed" through the water, the easier it will be for her to stay. Accordingly, all of your body, including arms, legs, torso and head should stay parallel to the surface of the water.
Now let's look at how to keep your head and breathe while swimming. In water, many instinctively begin to lift my head so as not to swallow the water. Note that the higher you lift the head, the harder it is to swim. Therefore, the head should be submerged at least halfway. To not nahlebalsya water, there are a few tips. First, breathe in through your mouth at a moment when, during the next stroke (if you're swimming the crawl) the head is turned to the side. Then exhale with your nose in the water. If you follow this recommendation, the danger of ingress of water into the lungs will be almost eliminated. So use your mouth for breathing, and nose for exhalation. Now you know how to learn to swim, wish you have succeeded!