By his own assessment, Dick Hoyt wasn't in racing shape the first time his teenage son Rick, a quadriplegic with cerebral palsy, asked if they could participate in a 5-mile fund-raising race father pushing son in a wheelchair. "I said, 'Yeah, let's go down there and try it.' I had no idea what would happen, and nobody else did, either," Mr. Hoyt later recalled. "Most people expected us to go down to the corner and come back, but we ended up doing the whole thing." From those first racing steps, the two became legends in running circles and inspirational worldwide as they participated in more than 1,000 competitions, including dozens of marathons and multiple triathlons. Mr. Hoyt ... was 80 when he died of heart failure Wednesday. Though Mr. Hoyt and Rick posted a best time of 2:40:47 in the Marine Corps Marathon " a pace many marathoners will never touch running alone " the teaming of father and son was, for both, more important than all else. "When we're out there," Mr. Hoyt told the Globe in 1990, "there's nothing I feel I can't do with Rick." "Dick started this whole movement of duos, and Team Hoyt inspired thousands of people around the world," said longtime Boston Marathon race director Dave McGillivray. "He helped open the door to people believing in themselves, and the walls of intimidation crumbled." Most runners would be too intimidated to even try what Mr. Hoyt did over and over again " push a wheelchair carrying a boy, who became a grown man, up and down hills for 26.2 miles.