Is cold exposure beneficial for metabolic health?...MITOCHONDRIA HEALTH: AN EXPLORATION OF TEMPERATURE AND LIGHT THERAPY...Mitochondrial Health: Biohacking Strategies

"Cold exposure therapies are forms of short exposure to cold temperatures (which don’t have to be as extreme as Norway in mid-winter). Cold showers, ice baths, open water swimming, and even short walks in cold weather are all forms of cold exposure therapy. Goals of cold exposure therapy include boosting energy expenditure and improving metabolic health. Though the precise activities and durations may vary, for the purpose of improving metabolic health, cold exposure therapies are all rooted in the same simple rationale: production of heat (known as “thermogenesis”) requires an expenditure of energy. In cold environments, the body must produce more heat to maintain its temperature, thus burning more calories."
https://peterattiamd.com/is-cold-exposure-therapy-beneficial/

"There is evidence that cold therapy improves mitochondrial health through a process known as “mitochondrial biogenesis,” or in other words, by producing more of them.1

Getting started with cold therapy is pretty simple. Boost your mitochondria by ending your hot showers with 30 seconds of water as cold as you can get it. Even 30 - 90 seconds of cold water can have profound effects according to a study in PLoS One2."
https://www.qualialife.com/mitochondria-health-an-exploration-of-temperature-and-light-therapy-28ff9793-1e48-42f8-9943-bc59446c52fd

"Combined with exercise, cold therapy increases the process of mitochondrial creation (9).

Cold water reduces muscle soreness and damage from exercise (10).

A hot-to-cold shower (cold exposure for 30-90 seconds) reduces the frequency of reported illness (11).

Exposure to cold increases brown adipose tissue (which increases metabolic rate, mitochondria, and ability to process blood sugar and fats in the blood) (12)."
https://www.tcimedicine.com/post/mitochondrial-health-biohacking-strategies