To set up some of the upcoming drills and to remind ourselves that butterfly is a symmetrical stroke, we're going to start to begin to alternate sides. This particular exercise has you swimming a single-arm butterfly using one arm for halfway and then switching to the other arm for the second half of the length. As you switch from the left arm to the right arm or the right to the left, try to make sure you maintain the same rhythm. The hand enters the legs kicked down, the hand exits the legs kicked down, and then the switch right there, you're centered and then you move to the other side. We will continue this progress as we move forward.

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Single-Arm Butterfly - Half Right Half Left