<http://schema.org/alternativeHeadline>
"Light activity during prolonged periods of sitting, like walking around during TV commercials, can help alleviate the ill effects on the body."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/stand-up-prolonged-sitting-may-raise-risk-of-disability>