After completing military service, Walter Gulick takes a job as a sparring partner at a gym, the owner of which sees potential in Walter as a professional fighter—and takes him under his wing.
A retired boxer intends to return to the ring for one last shot at the title, but first he must make the weight. Holed up in a room in Las Vegas with an unscrupulous trainer, he embarks on an intensive and illegal weight-cutting program.
A female boxing trainer discovers that her champion cage-fighter boyfriend has been cheating on her with her sister and decides to seek revenge by training up his arch-rival to challenge him.
After facing brutal humiliation in the ring, a young karateka travels to China in order to study the ancient art of Shaolin Kung Fu, becoming the first American Shaolin.
Diana Guzman, a troubled Brooklyn teenager, decides to channel her aggression by training to become a boxer, all while keeping it a secret from her father.