1-2-3 strategy
From Openwaterpedia
noun - 1-2-3 strategy is a simple strategy for channel swimmers or marathon swimmers, or any open water swimmer, that dictates they (1) walk in, (2) swim across, and (3) walk out to successfully complete an open water swim.
Origin
Per usage by Michael Miller of Hawaii circa 1979 when he first crossed the Molokai Channel.
