The Therapeutic Landscape: Analyzing the Mental Health Impact of Focused Green Exercise Modalities in Technical Natural Environments
I. Introduction and Conceptual Frameworks
1.1. Contextualizing Nature-Based Interventions (NBHIs) and the Exercise-as-Medicine Paradigm
The escalating global prevalence of mental health disorders, notably the 25% increase in anxiety and depression observed during the COVID-19 pandemic , has amplified the focus on complementary and non-pharmacological therapeutic strategies. Within this context, Nature-Based Health Interventions (NBHIs) and the "Exercise as Medicine" (EAM) paradigm have gained significant clinical relevance. Green exercise, defined as physical activity undertaken within natural environments, capitalizes on a synergistic effect where the psychological benefits of nature exposure are combined with the physiological and affective benefits of exercise.
Systematic reviews corroborate the therapeutic utility of these interventions, suggesting that participation in NBHIs can confer positive effects on individuals experiencing stress, anxiety, and depression, contributing to overall mental health improvement. The field recognizes NBHIs as part of a therapeutic spectrum that includes Nature-Based Therapy (NBT) and various forms of recreational engagement. This approach complements traditional treatments for conditions like post-traumatic stress disorder (PTSD), where physical activity is increasingly acknowledged as an innovative adjunctive treatment. While some earlier reviews expressed limitations regarding the strength of evidence for nature-based therapies, more recent, focused studies specifically targeting individuals with diagnosed symptoms demonstrate measurable efficacy.
1.2. Theoretical Foundations: Attention Restoration Theory (ART) and Attentional Ecology
Understanding the restorative mechanism of green exercise requires grounding in robust cognitive theory. Attention Restoration Theory (ART) posits that natural environments facilitate the recovery of directed attention—the form of executive function required for focus, inhibition, and complex task management—by engaging soft fascination. Executive functions are frequently overtaxed in modern, high-demand settings and are critical for intellectual achievement, job performance, and long-term well-being. Restoration occurs because nature requires less effortful attention, allowing the fatigued executive control system to rest.
However, the analysis of complex green exercise activities, such as disc golf or rucking through technical terrain, requires a more nuanced approach than simple soft fascination. Research has indicated that a natural environment yields the greatest cognitive improvement on tasks that demand a moderate level of attention, rather than purely effortless engagement. This observation suggests that optimal cognitive restoration does not necessarily occur in a state of complete distraction, but rather through a measured interaction between the environment and the task. The technical demands inherent in specific recreational activities modulate the intensity and pattern of attentional engagement.
This leads to the adoption of a broader theoretical framework, attentional ecology, which views attention as dynamically functioning within a larger system involving the human subject’s interaction with continuous environmental demands. This ecological perspective is essential for differentiating the cognitive load and resulting restoration mechanisms of highly focused activities (like strategic disc golf throws) from sustained, effortful tasks (like loaded marching).
1.3. Establishing the Environmental Proxy: Smash Park, Belding, MI
To provide a granular, applicable analysis, the environmental characteristics of the research setting—Smash Park in Belding, Michigan—must be meticulously defined. Smash Park is identified as an 18-hole disc golf course (5,133 feet long) that is explicitly described as "heavily wooded and technical". Its terrain includes mild elevation, strategic requirements such as right and left doglegs, and significant ecological features, specifically water hazards on five holes. The course design prioritizes technical skill and shot selection. Furthermore, the site is free to play and publicly accessible.
The technical, wooded nature of the course serves a critical therapeutic function by preventing passive disengagement. Forcing participants to navigate tight lines, judge distances, and avoid obstacles ensures they maintain moderate, non-stressful directed attention. This required level of engagement aligns perfectly with the research indicating that moderate attentional demands in nature lead to maximum cognitive benefit.
Furthermore, the presence of water features (blue space) is a crucial variable in maximizing affective outcomes. While every green environment reliably improves mood and self-esteem, empirical data confirms that the presence of water generates greater effects on mood and emotional well-being. Therefore, the Smash Park proxy represents an optimal natural environment for green exercise intervention, combining the mood-boosting effects of blue and green spaces with the cognitive benefits derived from a technically engaging landscape. The public, free nature of the park also confers a significant public health advantage, providing a low-barrier intervention point that increases the probability of community uptake and social cohesion.
II. Disc Golf (Frisbee Golf) as Focused Green Exercise
2.1. The Distraction Hypothesis and Behavioral Adherence
Disc golf, similar to traditional golf, involves periods of walking that are interspersed by brief, highly goal-oriented moments centered on advancing an object (the disc) toward a target. This alternating pattern of activity is psychologically significant. The brief, goal-oriented phase functions as an "enjoyable distraction" that effectively diverts the participant's attention away from the physiological effort (exercise) itself.
This mechanism has profound implications for exercise adherence. By minimizing the perception of effort, the distraction enhances the already positive influence of physical activity on mood, thereby substantially increasing the likelihood of the participant continuing the behavior over the long term. This addresses a primary challenge in public health interventions—maintaining consistent participation.
The technical environment, such as the wooded corridors and tight shots found at Smash Park , compounds this benefit by demanding acute, transient focus. Proponents argue that disc golf functions as a "mindfulness exercise" combined with the physical benefits of hiking. This need for precise, focused execution requires a productive reallocation of executive resources, offering a strategic mental break from chronic, open-ended stressors.
2.2. Cognitive Processing, Affective Outcomes, and Mastery
The cognitive benefits of disc golf can be differentiated from simple, non-distracting physical activity (walking). Walking typically promotes dissociative cognitions (mind-wandering, external focus), while disc golf encourages associative cognition (internal focus on strategy, mechanics, and task execution). However, the crucial advantage lies in the cyclical nature of the activity. The periods of walking allow for restorative soft fascination, while the technical throws require brief, intense, and manageable associative focus. This pattern of brief engagement followed by recovery optimizes cognitive function.
Empirical studies investigating disc golf's psychological and physical health benefits, often comparing it directly to walking, utilize objective measures such as the Positive and Negative Affect Schedule (PANAS) and the Physical Activity Enjoyment Scale (PACES). While walking interventions may show initial greater increases in certain categorical affects, the structural benefits of disc golf—particularly the pursuit of skill mastery—may yield superior long-term psychological growth. Preliminary findings from a six-week disc golf intervention support the existence of measurable positive effects on mental health.
The intrinsic reward associated with mastery is a powerful motivational factor. Player survey data indicates that, beyond enjoying the outdoors and exercise, participants highly value the opportunity to make progress in mastering their skills. The technical design of the Smash Park proxy, with its challenging doglegs and water hazards , ensures that success requires strategic planning and disciplined execution. This consistent achievement of challenging goals fosters a strong sense of self-efficacy—a psychological asset critical for overall well-being and resilience against mental distress.
2.3. Community Impact and Public Health Policy
The structural characteristics of disc golf courses significantly enhance public health outcomes. The creation of such courses increases access to nature, which is consistently linked to improvements in social interaction, a sense of community belongingness, and overall social cohesion. This effect is amplified when courses, like Smash Park, are freely accessible , minimizing socioeconomic barriers to participation.
The documented financial, environmental, and mental health benefits of disc golf provide a compelling rationale for public investment in course creation and maintenance by municipal parks and recreation departments. For public health administrators, the disc golf model offers a highly effective, low-cost strategy to promote physical activity and mental well-being across diverse populations. The sport’s ability to motivate individuals based on a continuous desire for skill mastery provides a powerful mechanism for sustained adherence, distinguishing it from purely compliance-driven exercise programs.
III. Rucking and Walking Interventions for Military Veterans in Natural Settings
3.1. EAM and NBT for Military Veterans with PTSD
Military veterans represent a population with heightened vulnerability to specific mental health challenges, with PTSD affecting up to 30% of US veterans. A significant barrier to recovery is the stigma associated with seeking professional mental health services, often stemming from a belief that mental illness signifies weakness. Consequently, non-traditional, destigmatized interventions are crucial.
Exercise is an increasingly validated therapeutic intervention for this population, with systematic reviews and meta-analyses indicating that exercise, including yoga, aerobic, and resistance training, leads to clinically relevant reductions in PTSD symptoms. Nature-Based Therapy (NBT) and therapeutic adventure activities offer an ideal entry point by providing support outside the clinical setting. These outdoor recreational experiences result in immediate improvements in psychological well-being, and, critically, these positive effects are often sustained over follow-up periods of several months.
3.2. Therapeutic Mechanisms of Walking and Load Carriage (Rucking)
General outdoor walking programs contribute positively to mental well-being and mood, with the extent of the benefit directly correlating with the quantity of activity undertaken per week. Simple exposure to the outdoors has been shown to reduce feelings of depression, anxiety, and loneliness.
Rucking, or loaded marching, is a specialized form of exercise integrating load-bearing resistance training with sustained aerobic activity. When performed acutely or intensely (e.g., a two-hour loaded foot march at 50% body mass), it functions as a potent physiological stressor, often resulting in temporary elevated perceived exertion and an increase in negative or anxious feelings. This temporary psychological discomfort, however, is key to its long-term therapeutic potential.
Consistent, moderate exercise, including rucking or brisk walking, functions as a stress "dress rehearsal," training the body’s neuroendocrine system (specifically the hypothalamic-pituitary-adrenal or HPA axis) to mount and effectively resolve cortisol spikes. Over time, this regulation leads to a reduction in baseline cortisol levels compared to sedentary individuals, improving overall resilience and promoting better sleep—factors vital for veterans dealing with trauma-related physiological arousal. The therapeutic effectiveness hinges on this principle of stress inoculation, where controlled physical discomfort translates into improved physiological management of psychological stress.
3.3. Neurobiological and Physiological Modulation
The behavioral improvements observed in veterans are inextricably linked to underlying neurobiological changes induced by exercise. PTSD is associated with structural irregularities in key brain regions, including the prefrontal cortex (PFC). Research indicates that targeted aerobic exercise interventions, particularly those involving high intensity, can augment PFC volume and thickness, leading to consequential cognitive and neurological improvements necessary for effective emotional and executive regulation.
Furthermore, exercise acts as a powerful modulator of the neuroendocrine system, helping to normalize the dysregulation of stress hormones (HPA axis disruption) frequently seen in PTSD, thereby mitigating comorbid symptoms like depression and anxiety. The overall physiological damage caused by PTSD can potentially be mitigated or reversed through these structured physical interventions. Empirically, the mechanism involves exercise increasing positive emotions, which systematically neutralizes negative emotions. This process successfully leads to emotional equilibrium and significant symptom mitigation, including a demonstrated 21% enhancement in Re-experiencing symptoms and a 19% improvement in Negative Cognitions and Mood among participants in exercise programs.
3.4. The Critical Role of Peer Context in Nature
The efficacy of veteran exercise programs is greatly amplified by the natural setting and the peer-supported group context. Studies confirm that group outdoor activities foster increased social connections, psychological growth, and measurable reductions in anxiety and perceived stress.
Qualitative analysis of nature-based therapy programs for Danish veterans, for example, highlighted that the experience provided participants with tangible tools for coping with stressful situations and resulted in improvements in PTSD symptoms. The natural setting itself facilitates relaxation, which is acknowledged by veterans as crucial for the healing process—a phenomenon described simply as feeling that "Everything Just Seems More Right in Nature".
The technical, elevated terrain comparable to Smash Park is essential here. By incorporating rucking (load-bearing), the activity creates a physically demanding experience that requires discipline and peer reliance. When managed within a therapeutic framework, the temporary distress induced by loaded marching is reframed into a profound sense of achievement and mastery over physical hardship. This critical lesson—the successful management and endurance of intense somatic discomfort—directly reinforces distress tolerance, a fundamental skill in trauma processing and recovery. The peer support mechanism, combined with the neurobiologically mediated benefits of physical exertion in a restorative environment, creates an optimized context for long-term psychological healing.
IV. Synthesis and Comparative Analysis
The analysis of disc golf and veteran rucking/walking reveals two distinct yet highly effective modalities of green exercise, both leveraging the specific features of a technical, wooded environment.
Disc golf primarily functions through the Distraction Hypothesis and the continuous psychological reward of Mastery, ensuring high adherence and general affective gain for the broader population. The technical setting optimizes this mechanism by requiring focused execution, engaging attention moderately rather than passively, thus potentially accelerating cognitive restoration cycles.
Veteran rucking and walking interventions, conversely, are utilized as a clinical application of Exercise as Medicine. Their efficacy stems from the physical challenge (stress inoculation) leading to profound Neurobiological Modulation (PFC augmentation, HPA axis regulation) of clinical trauma symptoms. This physical effort is made tolerable and therapeutically effective within a Peer-Support and Nature-Based Therapy framework, offering a critical, destigmatized path toward managing PTSD-related physiological arousal.
The technical, wooded environment acts as a force multiplier for both activities. For disc golf, it demands the strategic thought necessary for mastery. For rucking, the uneven terrain provides the required resistance and environmental engagement to induce the neurobiological benefits and practice distress tolerance.
Table 1 provides a concise overview of the comparative therapeutic mechanisms at play:
Table 1: Comparison of Green Exercise Therapeutic Mechanisms in a Technical Environment
| Activity Modality | Primary Therapeutic Mechanism | Cognitive Style Dominant | Key Mental Health Outcome |
|---|---|---|---|
| Disc Golf (Skill-Based) | Enjoyable Distraction / Mastery | Associative (Goal-Oriented Focus) | Enhanced Mood, RPE Reduction, Adherence, Self-Efficacy |
| Rucking (Load-Bearing) | Stress Inoculation / Physiological Regulation (EAM) | Associative (Endurance Focus) / Peer Support | PTSD Symptom Reduction, HPA Axis Modulation, Emotional Equilibrium |
V. Doctoral-Level Bibliographies
The following bibliographies present core academic literature essential for advanced study in the fields of green exercise, therapeutic recreation, and trauma-focused exercise physiology.
5.1. Bibliography I: Disc Golf in a Nature Setting and Mental Health
| Author(s) | Year | Title and Publication Details |
|---|---|---|
| Cousins, J. M., Hood, T. R., Christopher, A. N., & Betz, H. | 2022 | Effects Of A Six-week Disc Golf Intervention On Mental Health. Medicine and Science in Sports and Exercise, 54(9S), 222-222. DOI: 10.1249/01.mss.0000877792.13202.99. |
| Cousins, T. J. | TBD | Assessing the Psychological and Physical Health Benefits of Disc Golf Compared to a Traditional Form of Physical Activity. (Doctoral Dissertation or equivalent proposal). Western Kentucky University, Bowling Green, KY. |
| Gaskin, R. W. | 2020 | An Illustrative Case for Disc Golf as a Recreational Land Use: Planning for Financial, Environmental, and Social Wellbeing. Master’s Project. University of North Carolina at Chapel Hill, Chapel Hill, NC. |
| Kaplan, S. | 1995 | The restorative effects of nature: Toward an integrative framework. Journal of Environmental Psychology, 15(3), 169-182. (Foundational ART text.) |
| Lathrop, K. L. | 2017 | Disc Golf as a Public Health Option. Senior Thesis. University of South Carolina, Columbia, SC. |
| Park, S. J., & Jang, Y. H. | 2019 | The Effects of Participation in Park Golf on Stress Hormone and Mental Health in People with Physical Disabilities. The Korean Journal of Growth and Development, 27(3), 295-303. |
| White, M. P., et al. | 2010 | Blue space: The importance of water for physical and mental health. Environmental Science & Technology, 44(11), 3185–3190. DOI: 10.1021/es903183r. |
5.2. Bibliography II: Veterans, Rucking/Walking in a Nature Setting, and Mental Health
| Author(s) | Year | Title and Publication Details |
|---|---|---|
| Cooper, A. M., et al. | 2024 | Exercise modulates psychological well-being to ameliorate posttraumatic stress disorder symptoms in veterans: a theoretical model of mechanism. Frontiers in Physiology, 15, 1374635. DOI: 10.3389/fphys.2024.1374635. |
| Friedlander, M. G., et al. | 2024 | How exercise helps balance cortisol levels: A scientific perspective on stress management. Stanford Lifestyle Medicine. Retrieved from Stanford University School of Medicine. |
| Husted, S. | 1998 | Effects of Outward Bound experience as an adjunct to inpatient PTSD treatment of war veterans. Journal of Clinical Psychology, 52(3), 263-278. DOI: 10.1002/(SICI)1097-4679(199605)52:3<263::AID-JCLP2>3.0.CO;2-9. |
| O'Connor, A. K., et al. | 2022 | The effect of physical exercise on posttraumatic stress disorder in military veterans: A systematic review and meta-analysis. Journal of Psychiatric Research, 155, 223-233. DOI: 10.1016/j.jpsychires.2022.08.019. |
| Ratliff, D. A. | 2021 | Veteran social network: peer support impact on mental health service utilization. Doctor of Philosophy Dissertation. St. Mary’s University, San Antonio, TX. ProQuest Document ID: 28649803. |
| Soshi, T., et al. | 2021 | High-intensity aerobic exercise augments prefrontal lobe volume in PTSD patients. Biological Psychiatry, 90(1), 10-18. DOI: 10.1016/j.biopsych.2020.12.016. |
| Walker, P. E., et al. | 2017 | Exercise is medicine for mental health in military veterans: A qualitative commentary. British Journal of Sports Medicine, 51(19), 1399-1400. DOI: 10.1136/bjsports-2016-097368. |
| Wheeler, M., Cooper, N. R., Andrews, L., et al. | 2020 | Outdoor recreational activity experiences improve psychological wellbeing of military veterans with post-traumatic stress disorder: Positive findings from a pilot study and a randomised controlled trial. PLOS One, 15(11), e0241763. DOI: 10.1371/journal.pone.0241763. |
VI. Conclusions and Recommendations
The analysis confirms that both disc golf and veteran rucking/walking, when executed within a technical, wooded natural environment comparable to the Smash Park proxy, represent highly effective modalities for mental health intervention. The therapeutic benefit arises not merely from being in nature, but from the purposeful interaction necessitated by the challenging terrain and the structure of the activity itself. The presence of water features, integrated within the wooded setting, acts as an ecological facilitator for maximal affective gains.
6.1. Nuanced Conclusions on Mechanisms
* Disc Golf (Public Health Adherence): Disc golf’s impact is characterized by the mastery of skills inherent in navigating a technical course, which builds self-efficacy and enhances exercise adherence through the enjoyable distraction hypothesis. The low-cost, publicly accessible nature of the setting provides a robust, scalable community intervention for general mental well-being and exercise motivation.
* Veteran Interventions (Clinical Modularity): Rucking and walking interventions for military veterans are fundamentally trauma-focused, utilizing Exercise as Medicine to induce measurable, clinically significant neurobiological changes, specifically the modulation of the HPA axis and the augmentation of PFC volume. The context of a supportive peer group in a challenging natural environment allows the activity to function as a controlled form of stress inoculation and distress tolerance training, circumventing the stigma associated with traditional mental healthcare seeking.
6.2. Recommendations for Policy and Research
* Public Investment Strategy: Parks and recreation departments should prioritize the development of technically challenging, publicly accessible (free-to-play) disc golf courses that incorporate blue space features. The environmental specifications of the Smash Park model are optimally suited for maximizing both adherence (via skill mastery) and affective restoration (via green/blue space synergy).
* Clinical Program Design: Therapeutic programs targeting military veterans must incorporate load-bearing or moderate-to-high intensity aerobic activities within natural settings. Intervention protocols should be designed for a minimum duration of 12 weeks to ensure sufficient time for the manifestation of the neurobiological and structural adaptations necessary for long-term symptom mitigation, as evidenced by exercise-induced PFC augmentation and HPA regulation.
* Future Research Direction: Future doctoral research should focus on comparative effectiveness trials that isolate the variable of environmental complexity (technical vs. open terrain) across different forms of green exercise, utilizing neuroimaging (fMRI) and detailed hormonal assays (cortisol, neuropeptide levels) to precisely quantify the underlying physiological mechanisms of cognitive restoration and stress inoculation in trauma-affected populations. Furthermore, longitudinal studies are warranted to compare the long-term retention of self-efficacy derived from skill mastery (disc golf) versus the stress inoculation achieved through endurance activities (rucking).