Walking, whether outdoors or indoors, is good for your body and mind. Experts say that going outside adds useful variety and mood benefits, while a treadmill is a reliable choice when weather, safety or time are barriers. The best plan is the one you will repeat often.
Walking outside vs treadmill: what outside adds
Outside, your speed and stride change naturally and you meet small hills and different surfaces. This variety works leg muscles in slightly different ways and challenges balance in a gentle way. It can make the walk feel a bit harder, which many people want.
Mind and mood
Being in nature is linked to lower stress and better mood. Reviews and large studies associate time in green spaces with lower stress markers like cortisol, better self-rated health, and fewer signs of anxiety and depression. Some research even shows short forest trips can boost natural killer cells, the immune cells that help the body fight infections and some cancer cells.
When a treadmill shines
A treadmill gives a stable, predictable surface. Handrails can help people who are unsteady or returning from injury, and you can train any day, in any weather. For runners who want outdoor-like effort indoors, a slight incline can offset the lack of wind resistance.
How to choose
If you can be outside safely, choose it often for the added mind benefits and natural variety. If weather, air quality, daylight, or safety are problems, indoor walking is still an excellent choice. What matters most is moving, and keeping the habit over time.
Sports (systematic review) – The Effects of Outdoor versus Indoor Exercise on Psychological Health, Physical Health, and Physical Activity Behaviour – 2023
Review of longitudinal trials finds limited but suggestive evidence that outdoor exercise can add benefits for some outcomes, with many studies showing no clear difference. Calls for more rigorous research.
International Journal of Environmental Research and Public Health (systematic review) – The Effects of Green Exercise on Physical and Mental Wellbeing – 2019
Across acute and longer-term trials, outdoor exercise often feels more enjoyable and can improve some affect measures, while physiological differences versus indoor exercise are small or unclear.
Scientific Reports – Spending at least 120 minutes a week in nature is associated with good health and wellbeing – 2019
Large population study links weekly time in natural settings with better self-rated health and wellbeing, supporting regular outdoor time as a simple target.
Environmental Health and Preventive Medicine – Effect of forest bathing trips on human immune function – 2010
Short forest trips increased activity and number of natural killer cells and related proteins, suggesting a possible immune benefit from nature exposure.
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