When Bill McDonough rides the commuter rail into Boston, a 40-minute trip from Hanson, the 55-year-old often offers his seat to others — even younger passengers. Super polite? No. He’s part of an anti-sitting movement that’s gaining followers as evidence continues to build that what was once considered a benign pastime can actually shorten your lifespan and lead to some debilitating problems. “I get annoyed when I have to sit down for a phone call or take notes,” said McDonough, the owner of Scribendi, an advertising company in Hanson.
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