One day, a son said to his father: “Dad, would you like to run a marathon with me?” and the father replied “yes.” They ran their first marathon together.
Another time, the son asked again: “Dad, would you like to run another marathon with me?” and the father replied “yes, my son.” Again.
Another day, the son said to the father: “Dad, would you run the Ironman with me?”
The ironman is a triathlon the most enduring that exists: 4 km swim, 180km bicycle ride, and 42 km run.
Anh the father answered, “Yes.”
The story seems simple. Until you watch this video: