"Within one cycle of freestyle, a swimmer is required to precisely complete upward of 15 distinct movements within the span of two strokes. As good as most athletes are at multitasking, that's still a very complex series of movements within a very short period of time. This complexity of movement can lead to a lot of different kinds of problems with the way a swimmer breathes and swims... Maintaining balance during the breath is all about consistency. Ideally, your rotation during breathing and non-breathing strokes should be exactly the same. This makes it easier for you to keep your body balanced in the water. This will help you reduce your stroke count, leading to more efficient (and usually faster) swims."