Developed by swim coach Bob Gillett, the Foil Monofin ($46) will help you hone your underwater propulsion abilities. You will have to learn the technique, but once you get it, you’ll be swimming like a dolphin. In addition to allowing for a powerful and undulating kick through the water, the monofin is also said to work the core and leg strength more than standard fins. Time to release your inner merman!

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