Study subjects were divided into four groups. One group tried to strengthen their finger muscles with physical exercise; one tried to strengthen their finger muscles by only visualizing the exercise; another tried to increase arm strength through visualization; while the last group did nothing at all. The trial lasted twelve weeks. When it was over, those who did nothing saw no gains. The group that relied on physical training saw the greatest increase in strength—at 53 percent. But it’s the mental groups where things got curious. Folks who did no physical training but merely imagined their
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