People who exercise regularly make 5-10% more money.
This paper investigates whether engaging in regular exercise leads to higher earnings in the labor market. While there has been a recent surge of interest by economists on the issue of obesity, relatively little attention has been given to the economic effects of regular physical activity apart from its impact on body composition. I find that engaging in frequent exercise is associated with a five to ten percent wage increase. This finding is fairly robust to a variety of estimation techniques, including propensity score matching and is not due to reverse causality.
Source: Kosteas, Vasilios D., The Effect of Exercise on Earnings: Evidence from the NLSY (June 23, 2011).
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