Too much exercise can dull the brain, study says

Too much exercise could be a bad thing, especially for your brain, according to a new study.

Researchers compared brain MRIs from athletes who trained moderately, to athletes who over-trained.
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The small study showed the athletes who over-trained displayed more fatigue in the cognitive control part of the brain system.
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Health experts say too much exercise can tire out the brain to the point that where you may have trouble making decisions.