When person runs, swims, cycles and performs any other strenuous exercise, pituitary gland releases endorphins: chemicals that release feeling of euphoria and that block sensations of pain. Endorphins are very closely linked to addictions, they were even discovered by accident when scientists were carrying out research on addictions and drugs. Researchers discovered that human brain contains its own neuro-chemicals, which are far more potent than heroin, opium and morphine. They also discovered that endorphins release in times of stress – in case of runners: after strenuous running. Endorphins make runner feel great after exercise and this effect is often referred as 'runner's high'. And it doesn't stop there: endorphins are also motivational. They namely help runner to feel energized throughout their whole day.
so... I think thats why people like to run
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