Dave Conway had a heart attack in 2018. He was only 30. The Clintonville, Ohio, resident had been experiencing fatigue and shortness of breath, finally going to the emergency room with what he thought was pneumonia. Instead, he learned he'd had a "widowmaker" heart attack and a 100% blockage in a major artery. "I thought people who had heart attacks or heart disease were older people who drink and smoke a lot and weigh much more than I did," Conway said. "Recovery has been really tough, but I'm willing to do whatever my doctors tell me is needed to keep...