The funny thing about Leopard Fist Ninja is that it doesn't actually include any ninjas...
Much of the film is a reasonable but unexceptional kung fu film set in the mysterious Chinese past... apart from the random appearance of the occasional black and white fighter.
The plot is (as you might expect) a bit hard to follow and not exactly original. The Japanese (who are evil of course) had invaded our heroes' land when they were children and killed their parents. Then they are sent to learn martial arts so they can avenge them. Et cetera...
Of course these films are generally not viewed for the story (which is just as well) but for the fighting so luckily there is a lot of fighting in the film and it isn't bad action at all.
As a film Leopard Fist Ninja is OK though adding "ninja" to the title was obviously a cash-in on the 80s ninja craze and seems a bit silly. The film was directed by Godfrey Ho (which explains the ninjas) though he didn't do his infamous trick where he spliced the film with footage from another completely different one. Which in this case is probably a shame.