The sun is the source of life on planet earth.
To optimize your physical wellness you must optimize the use of light and dark along with hot and cold.
Training for cold exposure
https://www.wimhofmethod.com/wim-hof-method-mobile-app
Benefits of sauna
https://www.mayoclinicproceedings.org/article/S0025-6196(18)30275-1/fulltext
Benefits of Hot Yoga
https://www.healthline.com/health/hot-yoga-benefits#getting-started
