Each human is a marvel of design. King David saw in his own body the art and craftsmanship of the ultimate Master. He also knew that life is like a race, swift and brief. Each one of us is slipping rapidly through life. After all, race contestants determine neither the course nor its prize.
Organizers decide such things.
Officials set the regulations and judge by them. Anyone who wants to win must run the designated course by the official rules. Your race, then, belongs to Another. If He gave you life, He also gives its goal. If He made you, He also plans out your true course.