Lounging around too much after a heart attack can set you up for another one, a new study says. Within a year of being treated for heart attack symptoms, people who sat around afterwards for more than 14 hours a day on average were at greater risk for another heart-related health emergency, researchers reported Monday in the journal Circulation: Cardiovascular Quality and Outcomes . Those with the lowest activity levels had 2.5 times the risk of another heart problem or death within the