Testosterone increased leading up to skydiving and was related to greater cortisol reactivity and higher heart rate, finds a new study. “Testosterone has gotten a bad reputation, but it isn’t about aggression or being a jerk. Testosterone helps to motivate us to achieve goals and rewards.”

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Testosterone increased leading up to skydiving and was related to greater cortisol reactivity and higher heart rate, finds a new study. “Testosterone has gotten a bad reputation, but it isn’t about aggression or being a jerk. Testosterone helps to motivate us to achieve goals and rewards.”