The first test seemed to me just proving that you can trick your body into releasing energy reserves by giving it the promise of some energy. In a philosophica

The first test seemed to me just proving that you can trick your body into releasing energy reserves by giving it the promise of some energy. In a philosophical sense, fatigue is “in the mind.” But in a physical sense, it’s a (rough and frequently mistaken) sense of what condition your body is in. Fatigue is a warning system that convinces you to stop before you hurt yourself. Drugs that shut down the body’s self-defense mechanisms let you can easily perform great feats of strength, but you may tear your muscles apart in the process.