Physical exercise reorganizes the human brain so that it responds better to stress and normal brain function is less likely to be affected by anxiety, researchers from Princeton University wrote in the Journal of Neuroscience.

In an animal experiment, the authors found that when very physically active mice were exposed to a stressor - cold water - neurons in their brains that shut off excitement in the ventral hippocampus became much more active. The ventral hippocampus is a region in the brain that regulates anxiety.

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