https://pubmed.ncbi.nlm.nih.gov/20026572/ https://pubmed.ncbi.nlm.nih.gov/20026572/ >The results indicate that treadmill walking improves spatial and temporal

https://pubmed.ncbi.nlm.nih.gov/20026572/ https://pubmed.ncbi.nlm.nih.gov/20026572/ >The results indicate that treadmill walking improves spatial and temporal gait characteristics more effectively than walking outdoors. At least in this study it seems better than walking outdoors for stroke victims. A lot of recent studies about the benefits of sunshine would lean me towards that way, but a treadmill is still super! For mood, it seems outdoor is best- https://www.nytimes.com/2017/06/28/well/move/for-exercise-nothing-like-the-great-outdoors.html https://www.nytimes.com/2017/06/28/well/move/for-exercise-no...