Resistance training and high-intensity interval training, can increase testosterone levels https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5510446/ "preconditioning exercise and HIIT improves TT by ~17% in previously sedentary older males, which was maintained after intervention despite the training volume reduction from ~150 min/week to ~3–6 min/week during the final training phase."

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