Every parent has watched a child get stuck. Not stuck in the way of ordinary frustration — that unsticks itself fairly quickly once the obstacle is removed — but stuck in a deeper, more persistent way. The child who refuses to go somewhere because something bad might happen, and who has reorganised their entire daily life around avoiding the possibility. The one who cannot tolerate uncertainty, who needs to know exactly what is happening and exactly how it will go, and who falls apart when the plan changes. The one who has learned, through anxiety or difficult experience, that the safest strategy is not to try — because not trying means not failing, not feeling, not being overwhelmed by something they cannot control.
This pattern — the narrowing of life in response to difficult thoughts and feelings, the avoidance of experience that has come to feel threatening — is one of the most consistent features of childhood anxiety and depression. And it is also, according to the research, one of the most reliably addressable. Not through the suppression of difficult feelings, which does not work, and not through the substitution of positive thoughts for negative ones, which works only partially. Through the development of something the research calls psychological flexibility — the capacity to hold difficult thoughts and feelings without being controlled by them, and to keep moving toward what matters regardless of whether the emotional weather is good.
This is the core of acceptance and commitment therapy for children. And the research on how well it works is now substantial enough to be clinically definitive.
What Acceptance and Commitment Therapy for Children Actually Is
Acceptance and commitment therapy — ACT — is a third-wave cognitive behavioural approach developed by Steven Hayes and colleagues in the 1980s and 1990s, and one of the most extensively researched psychological interventions of the past two decades. Unlike classical CBT, which targets the content of thoughts — seeking to identify and change unhelpful cognitive patterns — ACT targets the relationship a person has with their thoughts and feelings. The goal is not to feel better. It is to feel fully — including the difficult things — while continuing to act in accordance with one’s values.
This distinction matters practically. A child who has been taught to challenge their anxious thoughts has a useful tool for moments when the prefrontal cortex is sufficiently available to deploy it. But the anxious child, in the middle of their anxiety, does not reliably have access to that tool — precisely because the anxiety has compromised the cognitive availability it requires. ACT offers something that does not depend on the thinking brain being fully operational: the capacity to notice what is happening, to allow it to be there without fighting it or fleeing from it, and to choose what to do next based not on the feeling but on what matters.
For children, this is delivered not through abstract discussion of metacognition but through the experiential, creative, and play-based activities that are the natural medium of childhood learning and therapeutic change. Metaphors — the feeling as a weather system, the mind as a bus with unhelpful passengers, thoughts as leaves floating down a stream — make ACT concepts accessible to children well below the developmental threshold of formal abstract reasoning. And the six core ACT processes — acceptance, cognitive defusion, committed action, present-moment awareness, self as context, and values clarification — map directly onto the kinds of play-based, narrative, and creative activities that children engage with most readily.
What the Research Confirms
The evidence base for acceptance and commitment therapy for children has grown substantially in the past five years — with a cluster of well-designed studies and meta-analyses providing increasingly specific and clinically useful findings.
A 2025 meta-analysis of randomised controlled trials published in the Journal of Affective Disorders, by López-Pinar, Lara-Merín, and Macías, examined the process of change and efficacy of ACT for anxiety and depression symptoms in adolescents. The meta-analysis confirmed that ACT is effective for both anxiety and depression symptoms — and crucially, identified psychological flexibility as one of the main mechanisms of change, even in the long term for depression symptoms. This is a clinically significant finding: it confirms not only that ACT works but that it works through the specific mechanism it was designed to target, rather than through non-specific therapeutic factors alone. The therapeutic change is happening at the level the theory predicts.
A 2025 systematic review published in School Psychology Review identified 22 peer-reviewed studies using ACT with elementary-aged children between five and twelve — confirming its applicability across the full developmental range from early childhood through early adolescence. This finding is particularly important for the clinical practice context of the Play Therapy Toolbox: ACT is not only an adolescent intervention that can be adapted downward. It is an approach with a documented evidence base across the full childhood developmental range.
A 2024 systematic review and meta-analysis published in Psychopathology by Binder and colleagues, examining ACT-based interventions for stress reduction in children and adolescents, confirmed significant reductions in stress and improvements in psychological wellbeing across diverse populations and delivery formats — with group-delivered ACT producing particularly strong effects, consistent with the broader finding that the social and relational context of ACT delivery amplifies its individual outcomes.
A 2025 umbrella review published in PMC, examining the application of ACT in children and adolescent psychotherapy across multiple systematic reviews, confirmed that ACT produces meaningful improvements across anxiety, depression, stress, and emotional regulation in children — and that its effectiveness is broadly comparable to CBT for most presentations while offering specific advantages for children whose presentations are characterised by experiential avoidance and emotional rigidity rather than primarily by cognitive distortion.
A 2025 systematic review published in PMC examining ACT for psychosocial outcomes in children and young people with long-term physical health conditions confirmed preliminary evidence of ACT’s effectiveness across this population — with improvements in psychological flexibility identified as the primary mechanism, consistent with the findings of the López-Pinar meta-analysis in typically developing adolescents.
Why Psychological Flexibility Is the Core Mechanism
Understanding why acceptance and commitment therapy for children works requires understanding what psychological flexibility actually is — and why its development is so specifically and so reliably associated with improvements in anxiety, depression, and the experiential avoidance that underlies both.
Psychological flexibility has been described as non-judgmental acceptance of thoughts, emotions, and sensations; present-moment awareness; and taking meaningful, values-based action — including during difficult experiences. In plain terms, it is the capacity to have a difficult feeling without either being overwhelmed by it or organising one’s life around avoiding it. It is the difference between a child who notices their anxiety, acknowledges it, and goes to school anyway — and a child whose anxiety has gradually narrowed their life to the point where school refusal feels like the only available option.
The opposite of psychological flexibility is psychological rigidity — the pattern in which difficult thoughts and feelings function as absolute rules for behaviour, in which avoidance becomes the primary coping strategy, and in which the child’s life gradually contracts around the effort to not feel the difficult thing. This pattern is not a character flaw, and it is not a choice. It is a nervous system doing exactly what it was designed to do in response to experiences that felt threatening — and gradually generalising that response to more and more of the child’s world.
ACT addresses psychological rigidity not by arguing against it but by offering the child a fundamentally different relationship to their inner experience. Through the six core processes — accepting difficult feelings rather than fighting them, defusing from unhelpful thoughts rather than believing them, clarifying what genuinely matters and taking action toward it even when the feelings say no — it builds the specific capacity that the rigidity most directly erodes: the child’s experience of themselves as the author of their own choices, rather than the passenger in a life driven by anxiety avoidance.
The research finding that psychological flexibility is the mechanism of change — not simply a correlated outcome — is clinically significant. It means that ACT is not producing its effects through non-specific therapeutic factors alone but through the specific psychological process it was designed to develop. And it means that activities designed to build psychological flexibility — however they are delivered, and in whatever creative or play-based medium — are addressing the mechanism directly.
How ACT Works With Children in Practice
Acceptance and commitment therapy for children looks considerably different from ACT with adults — not in its theoretical foundations but in the medium through which those foundations are delivered. Children do not sit with a therapist and discuss the functional analysis of their avoidance behaviour. They play. They draw. They engage with metaphors. They tell stories. And the ACT concepts that, in an adult context, require explicit cognitive engagement, arrive in a child’s context through the natural medium of imagination and play.
The metaphors that ACT uses are particularly well-suited to children’s cognitive and imaginative capacities. The feeling as weather — present, sometimes intense, but passing — gives the anxious child a relationship to their anxiety that neither fights it nor surrenders to it. The mind as a bus full of unhelpful passengers — thoughts that shout instructions but do not actually have to be obeyed — gives the child the defusion experience that ACT is specifically designed to produce, through an image that is both vivid and immediately graspable. The values clarification work — what matters to you, what kind of person do you want to be — anchors the committed action component in something concrete and personally meaningful rather than abstract.
For younger children, these concepts are embedded in play directly: the character in the sandtray who is afraid but goes on the journey anyway, the story whose protagonist notices the difficult feeling and chooses what to do next, the creative activity that gives the child the experience of making something in the presence of discomfort — and discovering that the discomfort did not stop them.
Acceptance and Commitment Therapy for Children and The Play Therapy Toolbox
The Play Therapy Toolbox: 123 Simple Play Therapy Activities and Therapeutic Games Supporting Every Stage of Child Development from Age 3 to 12 draws on ACT principles throughout — and specifically on the understanding that psychological flexibility is built not through instruction but through the repeated, supported, experiential practice of approaching difficult feelings with curiosity rather than avoidance, within the safety of a warm and attuned relational context.
The activities addressing emotional rigidity, cognitive flexibility, and avoidance across the Toolbox are built around the ACT mechanisms the research confirms are most productive: acceptance of difficult inner experience rather than the fight against it, defusion from unhelpful thought patterns through the metaphorical and creative distance that play provides, and the identification and pursuit of what genuinely matters to this particular child — however young, however distressed, and however narrow their current relationship to their own experience has become.
Every activity comes with a therapeutic rationale grounded in peer-reviewed research, step-by-step guidance on how to conduct the session and exactly what to say, questions to use with the child, and a parent guidance note — because the research on ACT consistently confirms that the adult’s own psychological flexibility, modelled genuinely and without performance, is one of the most powerful ACT interventions available to any child. The parent who can sit with their own discomfort, who can say this is hard for me too and I am going to do it anyway, is offering their child a live demonstration of the capacity that acceptance and commitment therapy for children is designed to build.
Before You Begin: A Note on Professional Support
Before attempting any ACT-informed play activities at home with a child whose anxiety, depression, or experiential avoidance is significantly impairing their daily functioning, I would sincerely recommend consulting a qualified mental health professional experienced in ACT and child therapeutic approaches. The activities in the Toolbox are designed to be accessible to non-specialist adults — but they are most effective as part of a broader support plan that includes professional guidance where it is needed, and particularly where the presenting difficulties are severe or significantly entrenched.
Three Things Worth Knowing
The goal is not to feel better. It is to live better.
The most important shift that acceptance and commitment therapy for children offers — to children, to parents, and to professionals — is a fundamental reorientation of what therapeutic success looks like. The goal is not the elimination of anxiety or sadness or the difficult feelings of childhood. It is the development of the capacity to have those feelings and keep living anyway — to move toward what matters, to make choices based on values rather than avoidance, and to discover that the difficult feeling, when it is not fought and not fled, is survivable in a way that reorganising one’s life around avoiding it never quite allows. That discovery — experiential, embodied, and genuinely the child’s own — is what psychological flexibility is. And it is what the research confirms is the mechanism through which ACT produces its most lasting change.
Avoidance works in the short term and costs dearly in the long term.
The pattern that acceptance and commitment therapy for children most directly addresses — the narrowing of life around the effort to avoid difficult feelings — is entirely understandable and entirely counterproductive. Avoidance relieves anxiety immediately and reliably, which is exactly why it becomes so established so quickly. But every act of avoidance also teaches the nervous system that the avoided thing was genuinely dangerous, deepens the belief that the feeling is unmanageable, and reduces the range of life available to the child. The ACT activities in the Toolbox work by gradually, gently, and in the most developmentally appropriate medium available, offering the child a different experience: that the feeling can be present, and that life can continue alongside it.
You are the most important tool in the room.
Acceptance and commitment therapy for children is not delivered by techniques. It is delivered through the quality of the relationship within which those techniques are offered — and through the adult’s own genuine, modelled psychological flexibility. A parent who can sit with their child’s distress without rushing to fix it, who can acknowledge their own difficult feelings without being controlled by them, and who can demonstrate through their own behaviour that values-based action is possible even when the feelings say no, is providing the most powerful ACT intervention available. The activities in the Toolbox are the structure. Your own psychological flexibility is the model that makes the structure therapeutically meaningful.
Available Now for $5.99 — For a Limited Time
If this exploration of acceptance and commitment therapy for children gave you a sense of what becomes possible when children are helped to hold difficult feelings without being controlled by them, The Play Therapy Toolbox gives you 123 more activities built on the same foundation. The ebook is available now on Amazon at $5.99 for a limited time — with immediate access to 123 activities and 75+ full-colour printable worksheets for children aged 3 to 12.
Play is not preparation for life. It is life — in its most honest, most essential, most healing form.
Disclaimer: This article is intended as an educational and supportive resource for parents, caregivers, educators, and mental health professionals. It is not intended to diagnose, treat, or replace professional therapeutic or medical care. If a child is experiencing significant emotional, behavioural, or developmental difficulties, please seek guidance from a qualified mental health professional.
Rostislava Buhleva-Simeonova is a psychologist and game design specialist. She has worked with children, adults, and the elderly within various therapeutic programmes over the past eight years, all the while providing the much-needed playful twist that art and gamified experiences can bring to this sometimes uneasy setting. But it wasn’t until the birth of her daughter, Aurora, that this work took on an even deeper personal meaning. With her academic and real-life experience, honed through numerous trainings and sessions, she is currently authoring books and articles in the field of child psychology and development, offering expertise in art and play therapy to guide parents and caregivers, as well as professionals in the fields of social work and mental health, throughout various pivotal moments in children’s lives. Last but not least, all of her books have been “peer-reviewed” by her daughter, who testifies to the efficiency of these methods.
References
Binder, F., Mehl, R., Resch, F., Kaess, M., & Koenig, J. (2024). Interventions based on acceptance and commitment therapy for stress reduction in children and adolescents: A systematic review and meta-analysis of randomised controlled trials. Psychopathology, 57(3), 202–218. https://doi.org/10.1159/000535048
Burley, D. T., & McAloon, J. (2024). Group acceptance and commitment therapy for adolescent anxiety: A systematic review and meta-analysis. Journal of Contextual Behavioral Science.
Fang, S., & Ding, D. (2020). A meta-analysis of the efficacy of acceptance and commitment therapy for children. Journal of Contextual Behavioral Science.
García-García, P., et al. (2025). Application of acceptance and commitment therapy (ACT) in children and adolescents psychotherapy: An umbrella review. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC11267127
Hayes, S. C., Strosahl, K. D., & Wilson, K. G. (1999). Acceptance and commitment therapy: An experiential approach to behavior change. Guilford Press.
López-Pinar, C., Lara-Merín, L., & Macías, J. (2025). Process of change and efficacy of ACT for anxiety and depression symptoms in adolescents: A meta-analysis of randomised controlled trials. Journal of Affective Disorders, 368, 633–644. https://doi.org/10.1016/j.jad.2024.09.076
PMC. (2025). Acceptance and commitment therapy for psychosocial outcomes in children and young people with long-term physical health conditions: Systematic review of intervention studies. https://pmc.ncbi.nlm.nih.gov/articles/PMC13205000/
School Psychology Review. (2025). Acceptance and commitment therapy for children: A systematic review. https://doi.org/10.1080/2372966X.2025.2592300
Twohig, M. P., & Levin, M. E. (2017). Acceptance and commitment therapy as a treatment for anxiety and depression: A review. Psychiatric Clinics of North America, 40(4), 751–770