The paper discusses the importance of psychological flexibility as a fundamental aspect of psychological health. Traditional perspectives on psychological health focus on positive emotions, thoughts, strengths, and the satisfaction of basic needs, but these approaches fail to capture the dynamic and contextually specific behaviors people exhibit in daily life. Psychological flexibility encompasses the ability to recognize and adapt to situational demands, shift mindsets or behaviors when they compromise personal or social functioning, maintain balance among life domains, and be aware, open, and committed to behaviors congruent with deeply held values. The absence of flexibility is linked to various forms of psychopathology, including cognitive rigidities, behavioral perseveration, and difficulties in rebounding from stress. Research on psychological flexibility has been fragmented, but recent studies using experimental and longitudinal designs provide evidence for its benefits in enhancing well-being and resilience. The paper also highlights the role of executive functioning, default mental states, and personality configurations in fostering psychological flexibility. Overall, the paper emphasizes the need for dynamic, context-sensitive approaches to understanding and promoting psychological health.The paper discusses the importance of psychological flexibility as a fundamental aspect of psychological health. Traditional perspectives on psychological health focus on positive emotions, thoughts, strengths, and the satisfaction of basic needs, but these approaches fail to capture the dynamic and contextually specific behaviors people exhibit in daily life. Psychological flexibility encompasses the ability to recognize and adapt to situational demands, shift mindsets or behaviors when they compromise personal or social functioning, maintain balance among life domains, and be aware, open, and committed to behaviors congruent with deeply held values. The absence of flexibility is linked to various forms of psychopathology, including cognitive rigidities, behavioral perseveration, and difficulties in rebounding from stress. Research on psychological flexibility has been fragmented, but recent studies using experimental and longitudinal designs provide evidence for its benefits in enhancing well-being and resilience. The paper also highlights the role of executive functioning, default mental states, and personality configurations in fostering psychological flexibility. Overall, the paper emphasizes the need for dynamic, context-sensitive approaches to understanding and promoting psychological health.