Aerobic exercise like running, jogging, swimming and walking because all of these get your heart rate up.
The circulatory system provides your brain with a constant supply of oxygen-rich blood while your brain regulates your heart rate and blood pressure. ... Meanwhile, your bones are busy making new blood cells. Working together, these systems maintain internal stability and balance, otherwise known as homeostasis.
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According to my calculations I would say you ate something unusual or ate to much of something that made your stomach feel unpleasent
These are called pre exsisting conditions.