One of my big advantages in hand-to-hand combat is my adamantine bone density. The systematic strengthening of bones under tension, bending, torsion, fatigue, and sheer was a key element of my grandfather’s unorthodox training regimen. Bones respond to stress the same way muscles do. Injure them slightly, and they heal back stronger. Continue that process systematically for twenty-five years, and what you get is a skeleton made of drastically different stuff than yours. Think of the difference between you and the winner of last year’s World Strongest Man competition. Can you flip an 8,000
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