Cycling or walking to work 'improves psychological health'

"The team studied 18 years of data from almost 18,000 commuters in the UK aged 18-65. The data took in various aspects of psychological health including feelings of worthlessness, unhappiness, sleepless nights and capability of dealing with problems.

Factors that are known to affect well-being, such as income, having children, moving house or job, and relationship changes were also taken into account by the researchers.

The results suggest that people benefited from improved well-being when they stopped driving and started walking or cycling to work. Commuters reported that they felt better able to concentrate and "less under strain" if they used these methods of travel, rather than driving a car. "

http://www.sciencedirect.com/science/article/pii/S0091743514003144

http://www.medicalnewstoday.com/articles/282497.php