Exposure to trees relaxes and restores your mind, lowering your blood pressure and heart rate.
Donovan, Geoffrey H., David T. Butry, Yvonne L. Michael, Jeffrey P. Prestemon, Andrew M. Liebhold, Demetrios Gatziolis, and Megan Y. Mao. 2013."The Relationship Between Trees and Human Health: Evidence from the Spread of the Emerald Ash Borer." American Journal of Preventive Medicine 44.2 (2013): 139-45. Elsevier. Web. 13 January 2016.