I am constantly looking for new ways to teach swimming. I attend coaches clinics and swim camps whenever possible to keep updated and inspired to teach swimming better. For the last year or so I have been putting a lot more emphasis on body position than on the pulling and kicking motions based on information learned from top level coaches like Terry Laughlin, Emmett Hines, Bill Boomer, & Tom Avischious. But change is a long slow process. I hope I can help you understand some of these concepts better in this article.
Do you remember in grade school the teacher or your parents telling you to improve your posture. "Sit up STRAIGHT, young man! Stop SLOUCHING in your seat! I remember that distinctly from both parents and teachers (Maybe if I had listened, I wouldn't have had back surgery at age 30). To grow up with all our body parts working properly it was necessary to treat our body well by maintaining proper posture and body strength.
Well guess what, posture in the water is just as critical to swimming well. Most swimmers have some GLARING posture defects which cause them to either swim MUCH slower than they are capable or work MUCH harder to swim at the same speed. The main two goals in swimming faster are to minimize or reduce drag and to maximize propulsion. Instead we are using most of our energy overcoming poor posture in the water and we are not achieving either! Through Snooper video taping over the last few months, I have found most swimmers drastically out of alignment throughout much of their stroke. To swim faster, we must stop spending so much time trying to work harder, and find ways to swim the same speed with LESS effort (lower heart rate). Keeping your heart rate lower will allow you to maintain better body position and speed for a longer period of time. Improving your body position (posture) in the water is the quickest way to do this.
Learn to feel weightless in the water by balancing your body in the water. This is difficult to do since the center of your body mass is about 6 inches above your navel, but your center of buoyancy is between your armpits. By pressing the head and chest into the water with the right pressure your buoy will float perfectly horizontal at the surface. VERY few swimmers do this well. Usually, the head position is far higher than the hips which forces the legs to work harder and the arms to press down to support the head instead of reaching out in front for more distance. This increases the heart rate because the legs are working harder and more arm strokes are required to cover each length.