"The essential thing is action. Action has three stages: the decision born of thought, the order or preparation for execution, and the execution itself All three stages are governed by the will. The will is rooted in character, and for the man of action character is of more critical importance than intellect. Intellect without will is worthless, will without intellect is dangerous."
—Hans von Seeckt

 https://www.marines.mil/Portals/59/Docs/SecretToPullupsHowToGoFrom0To20.pdf

"Become a leaner, more muscular version of yourself. Reach higher levels of speed, power, and endurance. Whatever your goal,
you must become strong first. All Marines becoming stronger will make the Marine Corps more combat effective. “Sparta, Rome, the knights of Europe, the samurai...all worshipped strength because it is strength that makes all other values possible.” Most of us have not even ‘scratched the surface’ of our strength potential. Let’s get started."

 

https://www.marines.mil/News/News-Display/Article/673308/zero-to-twenty-plus-marine-develops-program-to-improve-pull-ups/