Study shows daily walks lower risk of cognitive decline Fox News senior medical analyst Dr. Marc Siegel joins 'America's Newsroom' to react and discuss why liver cancer cases are projected to double by 2050. NEW You can now listen to Fox News articles! About one in five Americans do not get any physical activity outside of work, and where you live may play a major role in how likely you are to break a sweat during your time off, according to a new report. New federal data shows wide differences