Stress is the response of your body to challenge. Your level of stress predicts your performance in your job and your relationships. On the one hand, high levels of stress would cause strong anxiety, exhaustion, and impaired performance. On the other hand, low levels of stress would result in boredom, inactivity, and disengagement.
You need an optimal amount of stress to perform at your best. In psychology, this is known as the Yerkes–Dodson law, depicted in the figure below.
If you are a manager or a leader, make sure that your people are experiencing the optimal level of stress to stay engaged, motivated and at their best performance.