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2. The restorative benefits of walking in urban and rural settings in adults with good and poor mental health.                        (2010, November 10). Retrieved November 09, 2017, from http://www.sciencedirect.com/science/article/pii/S1353829210001322

3. Weir, K. (2011, December). The exercise effect. Retrieved November 21, 2017, from http://www.apa.org/monitor/2011/12/exercise.aspx

4. Sturm, J., Plöderl, M., Fartacek, C., Kralovec, K., Neunhäuserer, D., Niederseer, D., . . . Fartacek, R. (2012, April 06). Physical exercise through mountain hiking in high‐risk suicide patients. A randomized crossover trial. Retrieved November 21, 2017, from http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0447.2012.01860.x/full

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7. https://pixabay.com/