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If you pay attention to the details, 3-3-3 Butterfly is an excellent way to incorporate better technique into your butterfly. The idea is to focus on one or two technique points on the single-arm part of the drill…and then incorporate those points into your full stroke. Then repeat…over and over. Most swimmers don’t put a lot of thought into how they do this drill. Watch how Kelsi executes with great focus, attention, and precision.