Build your own mental gym

At this point, most people are aware of the benefits of physical exercise. It doesnโ€™t mean we actually act on itโ€”$1.8 billion spent on unused gym memberships in the U.S. onlyโ€”but we do know physical activity is good for us. What about mental exercise? Shouldnโ€™t we train our brains, too? Building mental strength is not …

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