> it's just common sense that the body is a machine and the more you stress a machine, the likelier it is to break. The body is a biological organism, not a ma

> it's just common sense that the body is a machine and the more you stress a machine, the likelier it is to break. The body is a biological organism, not a machine. Biological organisms that suffer disuse experience atrophy, wasting, and decay. Chronic controlled dosages of physical stress produce salutary effects in the human organism. Muscles grow and strengthen, bones increase in density, range of motion is preserved and increased, cardiovascular capacity increases, and even cognitive function is enhanced by exercise. You could not have summoned a worse analogy for the human body if it had been your intent.