This video talks about how a 51-year-old has a testosterone level of a 19-year-old using cold baths before workouts.

Hormones of the hypothalamic-pituitary-gonadal (HPG) axis in male depressive disorders - A systematic review and meta-analysis
https://pubmed.ncbi.nlm.nih.gov/31557...

Winter Cardiovascular Diseases Phenomenon
https://www.ncbi.nlm.nih.gov/pmc/arti...

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