A bit of history on the people involved:
http://www.teamhoyt.com/
For the past twenty five years or more Dick, who is 65, has pushed and pulled his son across the country and over hundreds of finish lines. When Dick runs, Rick is in a wheelchair that Dick is pushing. When Dick cycles, Rick is in the seat-pod from his wheelchair, attached to the front of the bike. When Dick swims, Rick is in a small but heavy, firmly stabilized boat being pulled by Dick.
At Rick's birth in 1962 the umbilical cord coiled around his neck and cut off oxygen to his brain. Dick and his wife, Judy, were told that there would be no hope for their child's development.
"It's been a story of exclusion ever since he was born," Dick told me. "When he was eight months old the doctors told us we should just put him away, he'd be a vegetable all his life, that sort of thing. Well those doctors are not alive any more, but I would like them to be able to see Rick now."
In 1975, Rick was finally admitted into a public school. Two years later, he told his father he wanted to participate in a five-mile benefit run for a local lacrosse player who had been paralyzed in an accident. Dick, far from being a long-distance runner, agreed to push Rick in his wheelchair. They finished next to last, but they felt they had achieved a triumph. That night, Dick remembers, "Rick told us he just didn't feel handicapped when we were competing."
I once saw another clip where at the end of the race a reported told Dick that if it wasn't for his son holding him back he would have finished in medal position.
To this Dick replied: "Why would I want that? I'm only doing this for my son."