Sun, 04/30/2023 - 08:00 Tech Insider Brad Margist jumping into his cold plunge.Courtesy of Brad Margist Tags Strategy, Nordic, BI-freelancer, Plunge, cold plunge, Productivity, morning routine, Stress, Anxiety, water, cold therapy, contributor 2023, as told to, Lauryn Haas Source I'm a tech exec who starts every day with a 3-minute cold plunge. My mind has n…