Airofit Pro Breathing Trainer ($299)
The Airofit Pro looks like a high-tech mouth guard, but it’s actually a tool for strengthening your lungs. It pairs with a phone app that runs exercises designed to build respiratory strength, vital lung capacity, and anaerobic threshold. It’s perfect for helping freedivers and surfers hold their breath longer, or giving endurance athletes a boost.
Outside 19 May 2021. The Best Wearable Tech of 2021. https://www.outsideonline.com/2422725/best-wearable-tech-2021
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