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According to the Mayo Clinic, swimming, walking or running for 30 minutes a day will lower your blood pressure by four to nine millimeters of mercury, as much or more than some blood pressure medication. Yes, you could keep your phone with you while you exercise, but who needs the stress? And if you’d rather not exercise, blood pressure medication costs about $900 per year.

Paul Greenberg is a fellow at the Safina Center and the author of the forthcoming "iQuit: 50 Things to Do iNstead."

https://www.nytimes.com/2018/12/31/opinion/smartphones-screen-time.html?smtyp=cur&smid=tw-nytopinion