The Art of War has been applied to many fields well outside of the military. Much of the text is about how to fight wars without actually having to do battle: it gives tips on how to outsmart one's opponent so that physical battle is not necessary. As such, it has found application as a training guide for many competitive endeavors that do not involve actual combat.
During the Sengoku era in Japan, a daimyo named Takeda Shingen (1521–1573) is said to have become almost invincible in all battles without relying on guns, because he studied The Art of War. The book even gave him the inspiration for his famous battle standard "Fūrinkazan" (Wind, Forest, Fire and Mountain), meaning fast as the wind, silent as a forest, ferocious as fire and immovable as a mountain.
If you know both yourself and your enemy, you can win a hundred battles without a single loss.