Physical activity increases blood flow to your brain. In response, the brain is stimulated to release chemicals that promote a happy mood.
For example, exercise increases the availability of serotonin, gamma aminobutyric acid (GABA), brain-derived neurotrophic factor (BDNF), and endocannabinoids (source).
Studies have shown that hiking in forested areas actually may result in higher release of these chemicals. As a result, hiking in nature is more beneficial than walking in the city (source).
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