Stig Åvall Severinsen Ph.D. (born 1973, Aalborg, Denmark) is a four-time World Champion freediver and holder of two Guinness World Records. His lifetime passion for water and breath holding lead him to write the book breatheology the art of conscious breathing which appeared in Denmark in 2009 with the title Træk Vejret mere energi, mindre stress. It quickly became a bestseller and was subsequently translated and published in English in 2010 by Idelson-Gnocchi.
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