If you’ve ever swum with fins on, you know it’s a blast. Suddenly you’re zipping through the water twice as fast. While regular fins work fine for dolphin kick, you can make your feet even more efficient with a monofin.
Monofins have been around for a while, but most folks haven’t seen them. Here’s a blurb on monofin usage from Wikipedia:
“To differentiate between the use of monofins and conventional fins, the latter are sometimes referred to as stereo fins or bi-fins. The monofin swimmer extends arms forward, locking hands together, locking the head between the biceps. The undulating movement starts in the shoulders, with maximum amplitude towards the hips, the legs almost don’t bend to transfer the movement to the monofin. This technique is called the dolphin kick.”
Finis and other outfits make them, and you can pick up a pair online with prices starting around $50:

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