Yes Exercise is like Heroin, on a scale, but scientists think this euphoric sensation is what keeps people running, because you still get withdrawal. This theory was tested with rats, there were some in a cage with running wheels and one without running wheels. the rats that had access to the wheels ran more and more. on day nine the two groups of rats were each given food, the rats that had the wheel kept going on the wheel and lost weight while the others actually ate. Later in the experiment they put the rats on Naloxone and had observers who weren't aware of the experiment list they're actions. The rats who had the wheel showed more withdrawal symptoms then the rats who didnt have a wheel.
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