Why going outside is one of the gentlest things you can do for your nervous system
Yes, spending time outside genuinely helps with trauma recovery, and the research is clearer on this than most people realize. Time in nature lowers cortisol, regulates the nervous system, reduces rumination, and creates the kind of quiet that lets the brain begin to process what it has been carrying. For anyone healing from trauma, those are foundational.
I have known this in my body long before I knew it in words. Something happens when I step outside, especially into open air, wide sky, and the kind of stillness that only nature offers. The weight shifts, and I breathe differently. It’s enough to remember that the world is larger than whatever I am carrying that day.
This post is about what the science says, what I have experienced, and some simple ways to bring more of the outside into your healing.
What Does Spending Time Outside Actually Do For Your Mental Health?
The Japanese have a practice called shinrin-yoku, which translates literally to forest bathing. It is not hiking or exercise but simply being present in a natural environment, walking slowly, breathing deeply, and letting the senses take in what is around you. Researchers studying this practice have found that even short sessions of 20 to 30 minutes produce measurable reductions in cortisol, lower blood pressure, reduced heart rate, and improved mood.
What makes this particularly relevant for trauma recovery is the cortisol piece. Cortisol is the body’s primary stress hormone, and for those of us who have been through trauma, our cortisol systems are often dysregulated. We produce too much of it, too often, in response to things that are not actually dangerous. Nature is one of the most effective ways to bring that system back into balance without medication, without a structured program, and without requiring anything of us except presence.
A 2019 study published in Frontiers in Psychology found that spending just 20 minutes in nature, where participants felt they were interacting with it, was enough to produce a significant drop in cortisol. Twenty minutes is a walk around the block, sitting on a porch with your coffee, or standing in a patch of sunlight and letting yourself feel it.
Why Nature and Trauma Recovery Are So Deeply Connected
Trauma lives in the body. This is something we understand more clearly now than we did even a decade ago. It is not simply a memory or a story we carry but a physiological state that the nervous system returns to again and again, often without warning. The work of healing from trauma is, in large part, the work of teaching the nervous system that it is safe to settle.
Nature helps with this in a way that is almost impossible to replicate indoors. The sounds, the light, the movement of air, the feeling of ground beneath your feet, all of these send signals to the nervous system that it is okay to relax and exhale.
Researcher and psychiatrist Dr. Eva Selhub, co-author of Your Brain on Nature, has written extensively about how natural environments engage the parasympathetic nervous system, the part responsible for rest and restoration, in ways that built environments simply do not. When we are outside, especially in green or open spaces, anxiety decreases and our thoughts quiet.
For those of us healing from trauma, that quiet is absolutely necessary.
What I Have Learned From My Own Time Outside
I have spent a lot of time outdoors throughout my life, and I can tell you that the research matches what I have felt in my own body. There is something about open air and natural light that no indoor environment has ever been able to replicate for me. It is grounding in the most literal sense. When I am outside, I am in my body in a way I am not always able to access elsewhere.
Some of my most restorative moments have been the simplest ones. Sitting outside in the early morning before anyone else is awake or feeling the sun on my face and deciding to just sit in that warmth have been profound moments of healing. Watching the light change and listening to birds has reminded me that the world is beautiful, moving yet still here, and that I am still here too.
5 Grounding Exercises To Try Outside
These are simple exercises. They don’t require equipment, a perfect location, or a certain amount of time. They are simply ways of using the natural world as an anchor for your nervous system, which is one of the most effective and underused tools available to anyone in trauma recovery.
1. The 20-minute nature sit
Find somewhere outside to sit quietly for 20 minutes. No phone, no podcast, no agenda. Let your senses do the work. What do you hear? What do you smell? What is moving? This is the essence of shinrin-yoku, and it requires nothing.
2. Barefoot grounding
Take your shoes off and stand on grass, soil, or sand for a few minutes. This practice, sometimes called earthing, has been studied for its effects on inflammation and nervous system regulation. Beyond the science, there is something deeply calming about feeling the ground directly beneath your feet. Try it and notice what happens in your body.
3. A slow intentional walk
Not a workout. A walk where the only goal is to notice what is around you. Pick one thing to pay attention to, for example, the color of the light, the sound of the wind, or the way the air feels on your skin. This kind of intentional sensory attention pulls you out of your thoughts and into your body, which is exactly where nervous system regulation happens.
4. Morning sunlight
Before you reach for your phone in the morning, step outside for even five minutes and let natural light reach your eyes. Morning sunlight regulates cortisol and sets your circadian rhythm, which has a direct impact on mood, sleep, and anxiety. It is one of the smallest habits with one of the largest returns.
5. Water
If you have access to any natural water, a river, a lake, the ocean, or even a fountain in a park, spend time near it. The sound of moving water has been shown to activate the parasympathetic nervous system and reduce anxiety. There is a reason so many people describe water as healing. It genuinely is.
You Don’t Have To Go Far
One of the things I have come to understand deeply in this season of my life is that healing does not require distance. You don’t have to travel somewhere spectacular to access what nature offers. A backyard, a balcony, a park bench, a patch of sky visible from a window are enough to begin.
The practice is not about the destination but the quality of attention you bring to wherever you are. Five minutes of genuine presence outside will do more for your nervous system than an hour spent outdoors while your mind is somewhere else entirely.
Start where you are. Step outside when you can. Let the air change something, even just a little. That is enough.
Frequently asked questions
Does nature actually help with trauma?
Yes. Research consistently shows that time in natural environments lowers cortisol, reduces activity in the part of the brain associated with rumination, and engages the parasympathetic nervous system, which is responsible for rest and recovery. For trauma survivors whose nervous systems are often stuck in a heightened state, these effects are particularly meaningful.
What is shinrin-yoku and how does it help mental health?
Shinrin-yoku is a Japanese practice meaning forest bathing. It involves spending slow, present time in a natural environment without a goal or destination. Studies have found that even 20 minutes of this kind of nature immersion produces measurable reductions in cortisol and improvements in mood, focus, and feelings of well-being.
How long do I need to spend outside for it to help?
Research suggests that 20 minutes of genuine nature exposure is enough to produce a significant drop in cortisol. Quality of attention matters more than duration. Five intentional, present minutes outside will do more than an hour spent outdoors while distracted by a phone or racing thoughts.
What if I don’t have access to nature or green spaces?
You don’t need a forest or a beach. A balcony, a park bench, a patch of grass, or even five minutes of morning sunlight through an open window can provide meaningful nervous system benefits. The practice is about presence in whatever natural environment is available to you, not about having access to something spectacular.
Sources
Hunter, M. R., Gillespie, B. W., & Chen, S. Y. (2019). Urban nature experiences reduce stress in the context of daily life based on salivary biomarkers. Frontiers in Psychology, 10, 722.
Study finding that 20 minutes of nature exposure produces significant reductions in cortisol stress hormones.
Li, Q. (2010). Effect of forest bathing trips on human immune function. Environmental Health and Preventive Medicine, 15(1), 9–17.
Foundational research on shinrin-yoku and its measurable effects on stress hormones, immune function, and mood.Bratman, G. N., Hamilton, J. P., Hahn, K. S., Daily, G. C., & Gross, J. J. (2015). Nature experience reduces rumination and subgenual prefrontal cortex activation. Proceedings of the National Academy of Sciences, 112(28), 8567–8572.
Research showing that nature walks reduce rumination and activity in the brain region associated with negative self-referential thought.
Selhub, E. M., & Logan, A. C. (2012). Your Brain on Nature. HarperCollins.
Comprehensive overview of the research connecting natural environments to nervous system regulation, mental health, and cognitive function.
*This post is for informational purposes only and is not a substitute for professional mental health support. If you are working through trauma, please consider reaching out to a licensed therapist or counselor.
