This is amazing and I cried when I watched this being a father myself. The story goes like this...
A son asked his father, 'Dad, will you take part in a marathon with me?' The father who, despite having a heart condition, says 'Yes'.
They went on to complete the marathon together. Father and son went on
to join other marathons, the father always saying 'Yes' to his son's
request of going through the race together.
One day, the son asked his father, 'Dad, let's join the Ironman together.' To which,
his father said 'Yes' too. For those who don't know, Ironman is the toughest triathlon ever.
The race encompasses three endurance events of a 2.4 mile (3.86 kilometer)
ocean swim, followed by a 112 mile (180.2 kilometer) bike ride, and
ending with a 26.2 mile (42.195 kilometer) marathon along the
coast of the Big Island.
Father and son went on to complete the race together.