Methods to increase brown fat cells (mitochondria) include cold stimulation. Recommended: "Back Cool Tie" for 2 hours a day. This is a method to increase brown fat cells and mitochondria, leading to rejuvenation. Cold stimulation to activate brown fat cells includes cold water swimming and alternating hot and cold showers, but a new method involves wearing the "Back Cool Tie" to initiate metabolism. Mitochondria convert ingested food into ATP, creating our energy. Also, when energy is insufficient or in cold conditions, the mitochondria, which are abundant in brown fat cells, burn fat to produce heat energy. Basal metabolism is higher in winter than in summer; exposing the back to a cold environment increases basal metabolism. Furthermore, it has been reported in academic societies that the mitochondria, which are abundant in brown fat cells, are responsible for metabolizing white fat cells into heat, and that repeated exposure can increase the size of brown fat cells. Increasing them leads to improved stamina, fertility support, health maintenance, and is a health product and diet tool that helps prevent lifestyle-related diseases. For more details, please see the blog. Mitochondria hold the key to fertility and sperm power. https://senakadeyaseru.net/blog/mitochondrial-sperm/