"Low testosterone causes all the symptoms you have enumerated. Any type of interval training will boost testosterone, as will reaching sexual climax: more by having satisfactory sex than by masturbation. It is important to understand causes of low testosterone—they are categorised as primary and secondary—to know when a healthy diet and having sexual climax are the indicated treatment."
A physician friend shared this feedback:
"Low testosterone causes all the symptoms you have enumerated. Any type of interval training will boost testosterone, as will reaching sexual climax: more by having satisfactory sex than by masturbation. It is important to understand causes of low testosterone—they are categorised as primary and secondary—to know when a healthy diet and having sexual climax are the indicated treatment."