And that is exactly what happened. Before the retreat, the men were tested on every aspect we assume deteriorates with age: physical strength, posture, perception, cognition, and short-term memory. After the retreat, most of the men had improved in every category; they were significantly more flexible, had better posture, and even much-improved hand strength. Their average eyesight even improved by almost 10 percent, as did their performance on tests of memory. In over half the men, intelligence, long thought to be fixed from adolescence, moved up as well. Even their physical appearance
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