For example, Jiu-jitsu, Karate-jutsu, Krav maga are very popular among police academy & military camps around the world. Even Ken-jitsu is taught in Tokyo police academy as well, though not very popular outside of Japan. Those martial arts are designed not only to be very practical in physical contact (neutralize opponent in the shortest amount of time) but also increase the mental toughness. Their cousins (replace the jitsu with do) are more sporty and humane, thus popular in the Olympics.
Growing up watching a lot of Kung-fu/Wushu movies from Hong Kong, I was amazed how artistic it was: beautiful kicks, long-rally sparring time. After getting into Ken-do and boxing, I noticed a typical sparring match lasts at most a few minutes. Then, I came to realize that how a practical martial art is vs. the one with more emphasis on art form. I'm sure certain styles/forms of Kung-fu are more practical (i.e: focusing more on neutralize opponent) as they were intended to be. But over time, the dramatization of motion pictures destroy its original purposes.