To build an effective butterfly, utilize the single-arm drill. When working on single-arm butterfly, make sure you're trying to mimic butterfly, and not freestyle.
Why do it:
Breathing to the side, and keeping the arm straight for single-arm butterfly, keeps the recovery in a more butterfly like position. How to do it:
1 - We'll focus on single-arm butterfly with the non-pulling arm in the extended position.
2 - Push off and keep one arm straight out in front. Start to pull with the other arm, and allow the body to rotate a bit to the recovery side.
3 - When the arm recovers, keep it high and straight while the body rotates to allow for that high recovery.
4 - When you need a breath, turn your head to the side to allow the body to continue rotating for the proper recovery. How to do it really well (the fine points):
When you bend your arm for the recovery on this, you're really practicing a more freestyle like recovery. Some practice this drill by breathing directly forward, which can make it difficult to breathe and may reduce the connection of the entering arm and the hips. By rotating the body, the arms will be more in-line with a traditional recovery... which keeps the arms straight. Finally, remind the swimmers to NOT stay rotated to their sides on entry, but to pay attention to getting back to flat to initiate the pull.
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