Hercule Poirot would be appalled, but according to research, vigorous physical exercise is the key to boosting ‘the little grey cells.’ A study from the Mayo Clinic in Minnesota found that people with the best cardio-respiratory fitness also had the biggest brains, which would be a blow for Agatha Christie’s detective who did not believe in working up a sweat. In fact, for every standard deviation of difference in fitness levels, scientists showed that grey matter grew on average by 5.3 cubic cm.
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