ScienceDaily (Feb. 4, 2011) — A systematic review carried out by a team at the Peninsula College of Medicine and Dentistry has analysed existing studies and concluded that there are benefits to mental and physical well-being from taking exercise in the natural environment. Their findings are published in the research journal Environmental Science and Technology on February 4th 2011.
http://www.sciencedaily.com/releases/2011/02/110204130607.htm