Rest days are important, but to keep your brain as powerful as your muscles, don’t take too many days off in a row. Exercise helps boost the amount of blood bathing your noggin. And a recent study found highly fit older adults (between age 50 and 80) had significantly less blood flowing in eight gray matter brain regions after 10 days of not exercising at all.

SEE ALSO: 10 Great Foods To Pump Up Your Brain

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