Eustess is moderate or normal psychological stress interpreted as being beneficial for the experiencer. Eustress is the positive reaction(arousal) to stress that generates within us a desire to achieve and overcome a challenge. Our perceptions of a stressor are what determine if we are feeling distress or eustress.

Stress

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   Eustess is a good form of stress that can actually increase our performance at a task and our general happiness and sense of well-being.

Eustress versus Performance