Women have been cold plunging for well over 2,000 years. The Ama pearl divers of Japan historically dove naked with no scuba gear or air tanks, spending 2 to 7 minutes in the water taking sometimes hundreds of dives per day. Analysis of these women find their cardiovascular health is much better than age-matched peers who don’t dive, despite the fact that Ama divers smoke at a higher rate than other women in Japan. This is a fascinating rabbit hole to dive into if you’re interested in cold water

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