Ju (means "gentleness" and connotes flexibility) Jutsu (means "art" or "technique") was the standard pronunciation before the first half of the 20th century. However, Jiu-Jitsu and then Jujitsu were mostly used to define the martial art. However, the earlier spellings "Jujutsu" is still common in many places. Ju-Jitsu is still a common spelling in France, Canada, the United Kingdom and the United States while Jiu-Jitsu is most widely used in Germany and Brazil.
Jiu Jitsu puts you completely in the moment where you must have complete focus on finding a solution to the problem. This trains the mind to build that focus, to increase your awareness and capacity to solve problems.