Keep on the Side
Remember that you must keep on your side like a cutter. You must not roll over on your breast, but keep in a straight-line position, for, if you turn, or reach too far ahead with the upper arm, you will throw yourself out of position and lose the easy run.
And, as in all the other strokes, remember about breathing and relaxing, the great factors in making you swim easier, further and better than other swimmers. As the under arm is drawn down, take the quick breath or gulp of air through the mouth, closing the mouth and exhaling through the nose until the completion of the stroke, and then begin all over again. You will find that you do not have to make any effort to keep your body afloat while on the side, therefore you can relax more, and when you get the stroke and the breathing and relaxing in harmony, it will be dead easy.
Persist, practice daily and do not get discouraged, for all of a sudden it will dawn on you that you have mastered the stroke and will soon go through the movements intuitively.