Stress creates or harms performance.

Stress is caused by the interest chemical dopamine 0G3H4, and the alertness chemical norepinephrine 0G3H5. Too little prevents performance—need eustress to do things—but too much causes the suppression of brain activity. Stress can be reduced by other activites 0G3H3 and by offloading things 0A. Eustress is essentially motivation 0K.