What is good stress?

Eustress.

In contrast to negative or "bad" stress, eustress is beneficial to health. Eustress is experienced when a challenge or demand is accompanied by a sense of control and personal growth. For example, getting a promotion at work can be stressful, but it can also be energizing and rewarding, leading to greater creativity and productivity. Engaging in physical exercise or participating in a competitive sport can also create eustress. The concept of eustress emphasizes the importance of finding a balance between challenges and personal resources, rather than avoiding stress entirely.