On Your Own (2019)

An expelled boxing champion, who now is a high-school teacher, witnesses intolerable violence and throws her first punch to build justice against it, while putting on a mask.

Jake, full of anger after his father's death, is just starting to find a place for himself at his new Orlando high school - until Ryan, head of an underground MMA fight club, picks Jake out as a prime opponent. After being trounced by Ryan in front of the entire school, Jake begins training under the firm, moral guidance of a MMA master, where he learns how to fight... and how to avoid a fight. But it becomes obvious that a rematch will be inevitable if Jake wants to stop Ryan and his bullying, once and for all.

When one school teacher gets the other fired, he is challenged to an after-school fight.

The mob is trying to strongarm local martial arts schools, forcing young Jason Stillwell and his family to move after his father is injured defending their dojo. With his father now rejecting violence, Jason is forced to train on his own to protect himself and his best friend from the members of a rival karate school.

Nick and Ruben are hoodwinked into a "shootfighter" (no-holds-barred, to the death) martial arts match by the evil Mr. Lee, who has a grudge against world shootfighter champ(and teacher of Nick and Ruben) Shingo.

New Jersey teen Daniel LaRusso moves to Los Angeles with his mother, and soon strikes up a relationship with Ali. He quickly finds himself the target of bullying by a group of thugs, led by Ali's ex-boyfriend Johnny, who study karate at the Cobra Kai dojo under ruthless sensei John Kreese. Fortunately, Daniel befriends Mr. Miyagi, an unassuming repairman who just happens to be a martial arts master himself. Miyagi takes Daniel under his wing, training him in a more compassionate form of karate for self-defense and, later, preparing him to compete against the brutal Cobra Kai.

The new guy in a Los Angeles high school, Morgan, does some singing and fights hotshot Nick over disco dancer Frankie.

In the cruel world of junior high, Edwin suffers in a state of anxiety and alienation alongside his only friend, Flake. Misunderstood by their families and demoralized at school daily, their fury simmers quietly until an idea for vengeance offers them a terrifying release.

A former fighter reluctantly returns to the life she abandoned in order to help her sister survive the sadistic world of illegal fighting and the maniac who runs it.

The line between reality and fiction starts to blur when two best friends start making a movie about getting revenge on bullies.