Ninja Kids!!! A big-budget, live-action adaptation of a long-running animated TV skein, Takashi Miike's "Ninja Kids!!!" largely earns its exclamation points.

The Ninja Kidz Action Park, inspired by the hit YouTube channel Ninja Kidz TV, is set to open at American Dream in East Rutherford, New Jersey, on September 6.

But a small group for area youngsters want to emulate physics-defying acts of fitness that have been made famous by the popular “American Ninja Warrior” television show. And they are doing ...