
Magnuson demonstrates great technique utilizing a side-looking breath in butterfly. There are many swimmers that use this technique, but curiously, the forward breath persists in many butterflyers. I believe this is because many swimmers will not take the time to learn it and coaches will not take the time to teach it. If you can learn, it can be advantageous for several reasons:
1. Allows the swimmer to stay lower to the water on the breath, which means more of the swimmer's energy is directed to going forward.
2. Because of #1, the swimmer may be able to breathe more often without sacrificing speed.
3. Enables the swimmer to see the competition more effectively than with a forward breath. If the swimmer can breathe to both sides, this is an even more useful skill.
If you want to learn to breathe to the side in butterfly, here are a few pointers.
1. Work on your neck flexibility. In my opinion, this is the primary reason why swimmers who try side-breathing have difficulty - tightness in their neck prevents them from doing it correctly.
2. Be sure to keep your hips and shoulders on plane. By this I mean don't let your body roll to the side simply to get your side-breath.
3. Continue to do all the other technical elements of butterfly correctly. Strong kick, strong pull, good body dolphin, etc. The importance of these hasn't changed at all!