Be happy, live longer

It might sound obvious but a 40 year study has just published results that lead to the conclusion that people who are happy and positive tend to live longer than those who are unhappy and pessimistic. 

A study that followed nearly 5,000 university students for more than 40 years, for example, found that those who were most pessimistic as students tended to die younger than their peers. An even longer-term study that followed 180 Catholic nuns from early adulthood to old age found that those who wrote positive autobiographies in their early 20s tended to outlive those who wrote more negative accounts of their young lives.

As far as training goes it also says:

experiments on humans have found that positive moods reduce stress-related hormones, increase immune function and promote the speedy recovery of the heart after exertion

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-Lucas