Testosterone levels can, indeed, be affected by physical activity. I suspect you are incorrectly assuming this would necessarily lead to an increase/decrease in aggression? Hormonal reactions are far more complicated than that. While an increase in testosterone may be evident in aggressive behaviour, there are other hormones (such as cortisol and seratonin) involved which play an important role, too.Do you think testosterone levels are effected by certain roles a person could have. For instance do you think if a woman who joins the military will have higher levels of testosterone than if she was a stay at home mother? Likewise would men have lower levels of T if they were stay at home fathers instead of going to the military? I've seen studies suggesting this to be true, but these studies were from a video on youtube with sources i can't confirm.
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