For men, 12 to 15% body fat is a good range. You can under 10, you're pretty lean. It's symptom driven because I worked with one of the strongest men on the planet. His blood tests and his lifetime natural was testosterone 400. We see commonly can see testosterone in the 400 range with Olympic athletes.
Stan Efferding is an IFBB Professional bodybuilder and World Record Holding Powerlifter, currently holding the title as the Worlds Strongest Bodybuilder. He studied Exercise Science at the University of Oregon and has been training high school, Collegiate, and Professional athletes for over 25 years.
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