ACT Therapy: How to Build Psychological Flexibility (A Complete Guide)

Acceptance and Commitment Therapy (ACT) has emerged as a transformative form of behavioral therapy, renowned for its holistic and adaptable approach to enhancing mental health. Originating in the late 20th century, ACT uniquely integrates mindfulness strategies with behavior-change techniques, offering individuals a comprehensive framework for fostering psychological flexibility and resilience. This innovative therapy encourages clients to embrace their thoughts and emotions rather than suppressing or avoiding them, creating an environment where personal growth can thrive.

By emphasizing acceptance alongside commitment to action, ACT empowers individuals to navigate life’s challenges with greater ease while remaining true to their core values.

At the heart of ACT is the belief that genuine well-being arises from aligning one’s actions with personal values, even amidst difficult emotions. As participants learn to observe their internal experiences without judgment, they develop essential skills that allow them to respond more effectively to life’s inevitable struggles. This dynamic therapeutic process not only helps alleviate symptoms associated with various mental health concerns but also nurtures a deeper understanding of oneself.

With ACT’s emphasis on living authentically and meaningfully, individuals are equipped not just to manage their psychological pain but also to cultivate a rich and fulfilling life marked by purpose and clarity.

What is Acceptance and Commitment Therapy?

At the core of Acceptance and Commitment Therapy (ACT) is the concept of accepting one’s thoughts and feelings without judgment, while also committing to actions that are aligned with one’s values. ACT is built on the foundation of Relational Frame Theory. This theory of human language and cognition posits that we learn to relate symbols, words, and concepts in complex mental “frames,” allowing our thoughts to trigger the same emotional and physical responses as actual events.

ACT is a therapeutic approach not only encourages individuals to embrace their experiences mindfully, even when they are challenging, but also empowers them to take purposeful steps towards creating and living a meaningful life.

Traditional therapy often tries to teach you how to ‘stop the waves’ (your difficult emotions). ACT Therapy assumes the waves will always be there. Instead of fighting the ocean, ACT helps you build a more flexible, sturdy boat. By using the ‘6 bricks’ of the Hexaflex, you learn to navigate the storms without sinking, always steering toward the values that matter most to you.

Steven C. Hayes, the co-founder of ACT, explains:

“ACT is a contextual behavioral approach to intervention that uses acceptance and mindfulness processes and commitment and behavioral change processes to produce psychological flexibility.”

He defines psychological flexibility as:

“The ability to experience thoughts, feelings, sensations, and memories without needless defense…and to persist or change in behavior in service of chosen values” (Hayes & Lillis, 2012).

Cultivating Psychological Flexibility

By cultivating psychological flexibility, ACT aims to help individuals gain a deeper understanding of their thoughts and emotions, and to develop the ability to respond to them in a way that is in line with their personal values and long-term goals. Christopher McCurry explains that “our principles and ideals tell us where to direct our work and play, and our goals mark the progress we make” (McCurry, 2009).

Basically, the ultimate aim of ACT is to help clients identify values and direct their work and play to honor those values. This holistic approach to mental well-being emphasizes the importance of mindfulness, acceptance, and committed action in fostering psychological resilience and pursuing a fulfilling life.

Psychological Pain

One of the key objectives of ACT is assisting clients find better ways to manage the hurts and bruises associate with living. Russ Harris wrote that the aim of ACT is to create “a rich, full, and meaningful life while accepting the pain that inevitably goes with it.” Basically, ACT principles guide people in developing psychological flexibility, and that flexibility helps them navigate life pain and struggles (Harris, 2019).

Experiential Avoidance

In the context of Acceptance and Commitment Therapy (ACT), experiential avoidance is the phenomenon where a person is unwilling to remain in contact with unwanted private experiences, such as painful thoughts, emotions, memories, and bodily sensations (Bach & Moran, 2008. As a result, individuals take active steps to escape, suppress, or alter the frequency of these internal events and the situations that trigger them, even when doing so restricts their lives and is harmful. In excess, this protective practice is maladaptive because it inhibits long term growth. Although avoidance might offer short-term relief, it often paradoxically increases the intensity of the unwanted experiences and leads to greater psychological inflexibility and suffering over the long term.

Who Developed Acceptance and Commitment Therapy?

Acceptance and Commitment Therapy (ACT) was developed in the 1980s by psychologist Steven C. Hayes, along with his colleagues Kelly Wilson and Kirk Strosahl. The therapy is rooted in behavioral analysis and is part of what is known as the “third wave” of cognitive-behavioral therapies. ACT focuses on helping individuals to accept their thoughts and feelings rather than fighting them, commit to action aligned with their values, and develop psychological flexibility.

Radical Behaviorism Roots

Acceptance and Commitment Therapy (ACT) finds its earliest roots in the foundational principles of behavioral science, specifically the work of B. F. Skinner. In his seminal texts, such as Science and Human Behavior (1953) and his broader writings on behaviorism (1974), Skinner introduced the philosophy of Radical Behaviorism (Bach & Moran, 2008; Törneke, 2010).

Unlike earlier behavioral approaches that only focused on outward, observable actions, radical behaviorism proposed a groundbreaking idea: everything an organism does is considered behavior, including private, internal events like thinking, feeling, and remembering (Törneke, 2010; Harris, 2019).

From this perspective, our thoughts and emotions are not mysterious forces originating from a separate, unobservable mental world; rather, they are natural responses shaped by our unique learning histories and our environments. Skinner argued that these internal behaviors follow the same scientific principles of learning as our physical actions do, which laid the crucial scientific groundwork for addressing complex human suffering through a behavioral lens (Törneke, 2010; Harris, 2019).

Functional Contextualism

Building directly upon these principles, ACT is grounded in a modern philosophy of science known as Functional Contextualism, which evolved directly from Skinner’s Radical Behaviorism. While radical behaviorism established that all human activity is behavior, functional contextualism emphasizes that we can only truly understand a behavior by looking at the specific historical and situational context in which it occurs, as well as the function (or purpose) it serves (Bach & Moran, 2008).

In this framework, an anxious thought or a difficult emotion is never viewed as inherently “broken,” “faulty,” or “pathological” (Ciarrochi, 2018; Harris, 2019). Instead, an ACT approach focuses on the ongoing “act-in-context,” evaluating whether a person’s behavior leads to “successful working”—meaning it practically helps them move toward a vital, meaningful life.

By shifting the ultimate goal from mechanically fixing symptoms to evaluating how our actions function in the real world, Functional Contextualism transformed Skinner’s foundational science into the compassionate, flexible, and values-driven therapy that defines ACT today.

What is ACT Therapy? The Science of Psychological Flexibility

According to Acceptance and Commitment Therapy (ACT), psychological flexibility is the capacity to adapt to difficult experiences while remaining true to one’s values. It involves being open to one’s full range of emotions and thoughts, staying present, and committing to action that aligns with personal values, even in the face of challenging or unwanted situations. This flexibility allows individuals to pursue a meaningful life, enhance their well-being, and better handle the stresses and demands of life.

Professor Steven Hayes, the co-developer of Acceptance and Commitment Therapy, defines psychological flexibility as the ability to “make contact with experience in the present moment fully and without defense” (McKeever, 2020).

ACT founders propose that psychological flexibility is built on three pillars. These pillars are:

• opening up with acceptance and diffusion,
• be present with contact to the present and self-as-context
• do what matters through value clarity and committed action.

In practical terms, ACT is applied through a variety of exercises and techniques designed to help individuals develop psychological flexibility. These may include mindfulness practices, experiential exercises, and creating psychological distance from distressing thoughts.

See Psychological Flexibility for more information on this topic

Building Psychological Flexibility with Cognitive Defusion

Cognitive defusion builds psychological flexibility by fundamentally changing a person’s relationship to their thoughts, rather than attempting to alter the content, frequency, or truth of the thoughts themselves (Bach & Moran, 2008). It operates by undermining the problematic control that language and cognition can exert over behavior (Ciarrochi et al., 2010).

Normally, people tend to experience “cognitive fusion,” a state where they are so entangled with their thoughts that they treat them as literal truths, commands, or physical threats that must dictate their actions (Bach & Moran, 2008; Ciarrochi et al., 2010). In this fused state, a person looks from their thoughts, allowing verbal evaluations, rules, and negative self-concepts to rigidly govern their behavior and pull them out of the present moment (Hayes, 2012; Hayes, 2005).

How Cognitive Defusion Helps

Cognitive defusion counteracts this by helping individuals step back and look at their thoughts. By recognizing thoughts for what they actually are—merely passing words, sounds, images, or stories generated by the mind—the individual breaks the illusion of language.

Stephen C. Hayes explains:

“The point is to break through the illusion of language, so that you can notice the process of thinking (i.e., creating relations among events) as it happens rather than only noticing the products of that process—your thoughts. When you think a thought, it structures your world. When you see a thought you can still see how it structures your world (you understand what it means), but you also see that you are doing the structuring” (Hayes, 2005, p. 71).

This shift in perspective creates psychological distance, transforming thoughts from binding realities into observable events (Ciarrochi et al., 2010). For example, the thought “I am bad” shifts from being experienced as a literal, objective truth about the self to simply being noticed as a piece of verbal content that has shown up in the present moment.

How Defusion Fosters Psychological Flexibility

• Reducing Experiential Avoidance: When thoughts are no longer viewed as literal threats or absolute truths, the urge to avoid or suppress them diminishes. A person can simply notice a distressing thought or evaluation and allow it to exist without needing to fight it, argue with it, or escape the situations that trigger it (Bach & Moran, 2008).
• Restoring Behavioral Choice: Because defusion disconnects behavior from the strict control of literal words, it frees the individual from being pushed around by their internal chatter. The person realizes they can have a thought without having to obey it (Bach & Moran, 2008; Harris, 2019).
• Promoting Values-Based Action: Ultimately, the psychological “wiggle room” created by defusion allows a person to base their actions on direct environmental opportunities and chosen values, rather than on fused verbal rules. Even while having thoughts like “This won’t work” or “I am going to fail,” an individual can acknowledge the thought and still choose to take meaningful, effective action toward their goals (Bach & Moran, 2008; Harris, 2019).

Though the distinction between being fused with a thought versus seeing it as content seems subtle, the difference can have a massive impact on how one experiences events. 

~Patricia A. Bach, Ph.D. and Daniel J. Moran, PH.D. (2008, p. 166)

The 6 Core Principles of ACT: The Hexaflex Model

ACT is founded on six key principles (two in each pillar):

First Pillar: Be Open

1. Cognitive Defusion: This principle focuses on creating distance from one’s thoughts and learning to see them as passing mental events rather than truths. By achieving cognitive defusion, individuals can reduce the impact of negative thought patterns on their emotions and behavior.
2. Acceptance: Embracing difficult emotions and experiences is central to ACT. Instead of struggling against or avoiding distressing thoughts and feelings, individuals are encouraged to acknowledge and accept them as natural parts of the human experience.

Russ Harris explains that “diffusion is the very opposite of a control strategy; it’s an acceptance strategy. In ACT, rather than attempting to change, avoid, or get rid of unpleasant feelings, our aim is to accept them. Acceptance doesn’t mean you have to like your uncomfortable thoughts and feelings; it just means you stop struggling with them” (Harris, 2022).

Second Pillar: Be Present

3. Being Present: Mindfulness and awareness of the present moment are essential components of ACT. By cultivating a non-judgmental awareness of the present, individuals can better connect with their values and take intentional action.
4. Self-As-Context: This principle emphasizes the development of a transcendent sense of self that is separate from one’s thoughts and experiences. By fostering a broader perspective of the self, individuals can navigate life’s challenges with greater clarity and resilience.

Third Pillar: Do What Matters

5. Self-as-Context: Seeing yourself as the “observer” of your experiences. In ACT, “self-as-context” refers to the observing part of your mind that is simply aware of your thoughts, feelings, and actions in any given moment (Harris, 2019). While your physical body, life roles, and internal chatter constantly change over the years, this pure awareness remains a stable, unchanging viewpoint from which you experience the world (McKeever, 2020). By learning to step back into this psychological space, you can safely watch your difficult thoughts and feelings come and go without being harmed or controlled by them (Bond, 2018; Harris, 2022).
6. Values: Clarifying what is truly important to you. Values represent your heart’s deepest desires for how you want to behave, what you want to stand for, and what truly matters in the big picture of your life (Harris, 2019; Harris, 2022). Unlike specific goals that you can eventually achieve and cross off a to-do list, values are ongoing life directions that act like a compass to guide your daily choices (Harris, 2019; McKeever, 2020). By clarifying these core principles, you gain a powerful source of motivation that makes your journey feel rich and meaningful, even when you face inevitable hardships along the way (Harris, 2019; Harris, 2022).

ACT vs. CBT: Understanding the “Third Wave” Difference

To understand how Acceptance and Commitment Therapy (ACT) differs from traditional Cognitive Behavioral Therapy (CBT), it helps to look at the evolution of modern psychology. The first “wave” of behavior therapy focused primarily on observable behaviors and conditioning, while the second wave brought about a cognitive revolution that gave rise to CBT (A-Tjak et al., 2015; Bach & Moran, 2008).

Traditional CBT operates on the premise that irrational or faulty thoughts cause our negative emotions and dysfunctional behaviors. Therefore, a CBT approach typically focuses on symptom reduction by teaching clients to actively challenge, dispute, and replace these distorted thoughts with more rational ones (Bach & Moran, 2008).

ACT as the Third Wave

In contrast, ACT emerged as a major player in the “third wave” of behavioral therapies, which moves away from the goal of symptom reduction and the mechanistic view of fixing “broken” thoughts (A-Tjak et al., 2015; Bach & Moran, 2008). Instead, this third wave incorporates concepts like mindfulness, radical acceptance, and personal values to address the broader context of human suffering (Hayes & Lillis, 2012).

The core difference between ACT and CBT lies in how they handle difficult inner experiences. If you have the thought, “I am going to fail,” a CBT therapist might help you examine the evidence for that thought and restructure it into something more positive or realistic. ACT, however, does not try to change the content of your thoughts at all. ACT is based on the idea that trying to control or eliminate psychological pain is not only ineffective but often makes the suffering worse (Bach & Moran, 2008). Instead of cognitive restructuring, ACT uses a technique called cognitive defusion to change your relationship to your thoughts, helping you view them as simply passing words rather than literal truths (Bach & Moran, 2008).

The ultimate goal of ACT is not to eliminate anxiety or sadness, but to increase psychological flexibility—the ability to stay present and take meaningful action toward your chosen values, even when uncomfortable thoughts and feelings are along for the ride.

How to Practice ACT: Values-Based Action in Daily Life

Values

In Acceptance and Commitment Therapy, figuring out what you truly care about is essential to building a meaningful life (Harris, 2019). ACT draws a clear, fundamental distinction between values and goals (Bach & Moran, 2008).

When you go through life guided by your values, not only do you gain a sense of vitality and joyfulness, but you also experience that life can be rich, full and meaningful, even when bad things happen.

~Russ Harris (2022)

Think of values as a compass heading: you can travel west forever without ever “arriving” at west, but the compass keeps you consistently moving in your chosen direction. Goals, on the other hand, are the specific, achievable destinations you reach along that journey, like stopping at a particular landmark. For example, a goal might be “getting married,” which can be achieved and crossed off a to-do list, whereas a value is “being a loving partner,” which is an ongoing, lifelong process of behaving in a certain way (Bach & Moran, 2008).

To practice ACT in your daily life, start by looking inward and asking yourself: What do I want my life to be about, and what kind of person do I want to be?

Commited Action

Once you have identified your “true north,” the next step is committed action—translating those values into concrete behaviors. In ACT, this is where the “rubber meets the road” (Bach & Moran, 2008). It involves setting specific, realistic goals that align with your values and then taking the physical steps to achieve them. It is crucial to expect that stepping out of your comfort zone will inevitably bring up psychological barriers like anxiety, self-doubt, or fear of failure. Because we are most vulnerable when we pursue what is most precious to us, acting on our values naturally exposes us to the possibility of emotional pain (Hayes, 2005; Wilson et al., 2010).

Mindfulness

Mindfulness helps you experience emotions and thoughts without the intense drive to avoid them. Jon Kabat-Zinn explains:

“We may be so busy denying and forcing and struggling that we have little energy left for healing and growing, and what little we have may be dissipated by our lack of awareness and intentionality” (Kabat-Zinn, 2013).

Kabat-Zinn explains teaches that to cultivate mindfulness, we must “pay attention and inhabit the present moment, and make good use of what we see and feel and know and learn in the process.” We develop mindfulness “through exercising our capacity for attention and discernment” (Kabat-Zinn, 2013).

This is exactly why mindfulness and cognitive defusion skills are so necessary. They offer an approachable way to experience reality without excessive and overwhelming emotions. Practicing values-based action requires willingness—the conscious choice to make room for negative thoughts and uncomfortable feelings so that you can keep doing what truly matters (Harris, 2019). You do not have to take massive leaps; even taking the tiniest, simplest step forward in a valued direction counts as committed action.

Mindful Recognition and Change

Seymore Epstein (1926-2018), leading authority on personality, rationality, and dual-process cognition, wrote:

“The first step in changing reality is recognizing it as it is now. There is no need to wish it was otherwise. It simply is. Pleasant or not, it is. Then comes the behavior that acts on the present reality. Behavior can change what is. We may have visions of what may be. We cannot (and need not) prevent these dreams. But visions will not change the future. Action— in the present— changes the future. A trip of ten thousand miles starts out with one step, not with a fantasy about travel” (Epstein, 1998).

In the ACT framework, success is not defined by perfectly achieving all of your goals or successfully eliminating your distress. Instead, success is simply living by your values. By shifting your focus from the destination to the journey, you can find deep fulfillment and vitality in the present moment, even when challenges arise along the way.

What Disorders Does Acceptance and Commitment Therapy Treat?

Research supports using ACT as an effective therapy to address a wide range of psychological issues. ACT emphasizes the practice of acceptance and mindfulness. Accordingly, this therapy is particularly suitable for individuals seeking a more holistic and experiential form of therapy.

Clinicians use Acceptance and Commitment Therapy (ACT) o treat a variety of mental and physical conditions, including:

• Anxiety disorders (Salari et al., 2023)
• Depression (Zhao et al., 2023; Salari et al., 2023)
• Obsessive-compulsive disorder (OCD) (Morrison et al., 2020; Bakhtiari, 2025).
• Psychosis
• Eating disorders
• Substance use disorders
• Workplace stress
• Chronic pain
• Addiction
• Post-traumatic stress disorder (PTSD) (Rowe-Johnson et al., 2025)

ACT is particularly effective in increasing psychological flexibility, which is the ability to adapt to changing demands and commit to actions based on one’s values, even in the presence of difficult or unwanted thoughts, feelings, or sensations.

Associated Concepts

• Accepting Life: This refers to refers non-judgmental awareness and actively embracing thoughts, feelings, and bodily sensations as they occur. Acceptance does not refer to resigning to life circumstances as they are in the present.
• Stress and Coping Theory: A Theory, developed by Richard Lazarus and Susan Folkman, suggests that individuals experience stress when they perceive a discrepancy between the demands of a situation and their perceived ability to cope with those demands.
• Mindfulness-Based Stress Reduction (MBSR): MBSR incorporates mindfulness meditation and yoga to help individuals become more aware of the present moment and manage stress more effectively.
• Stress Management: Techniques and strategies used to control, reduce, and cope with the negative effects of stress. It involves identifying stress triggers, implementing healthy coping mechanisms, and making lifestyle changes to enhance well-being.
• Positive Psychology Interventions: These are strategies and activities designed to enhance well-being, increase happiness, and foster positive emotions, thoughts, and behaviors. These interventions are grounded in the principles of positive psychology.
• Present Moment: This refers to the idea of being fully engaged and focused on the current experience, without being distracted by thoughts of the past or future. This concept is often associated with mindfulness practices
• Gestalt Therapy Exercises: These are a series of exercises, originally developed by Frederick Perls, designed to assist in a therapeutic approach to stimulate growth through an expanding awareness of the self.

A Few Words by Psychology Fanatic

In conclusion, Acceptance and Commitment Therapy offers a unique and empowering approach to mental well-being. Harris simplifies the principles of ACT to acceptance and action. He explains they work side by side (Harris, 2022). Moreover, the tools used in ACT are integrating mindfulness, acceptance, and value-driven action to cultivate psychological flexibility and help them lead rich, fulfilling lives.

Last Update: March 9, 2026

References:

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Bakhtiari, B. (2025). The Effectiveness of Acceptance and Commitment Therapy Approach (Act) In Responsibility and Social Isolation of Obsessive Compulsive Patients. TMP Universal Journal of Research and Review Archives,
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Zhao, Bing, Qian Wang, Liping Wang, Jie Chen, Tongtong Yin, Jingxuan Zhang, Xiaojing Cheng, and Ruihua Hou (2023). Effect of acceptance and commitment therapy for depressive disorders: a meta-analysis. Annals of General Psychiatry 22.1. DOI: 10.1186/s12991-023-00462-1
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