I just knew it!
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2577501/
“In a study of more than 10 000 men who played tennis 3 times a week it was found that risk from death from any cause was reduced by 50%. In addition, when scientifically tested, tennis players who played tennis at least 3 hr a week had a 41% lower risk of death from coronary heart disease”.
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