Sneezing is a reflex, which means that it 's an uncontrollable physical response to an outsidestimulus.
打喷嚏是一种反射,也就是说它是一种生理对外界环境的反应,不可控制。
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Stress comes from the way we think and react to outsidestimulus, so people with anxious tendencies will react in a more fearful way than their calmer counterparts.
It's a great time for physical exercise because we have high body temperature, the fastest reaction to an outsidestimulus, and the greatest muscle strength and cardiorespiratory efficiency.