Extraordinary adrenaline-pumping stunts are a hallmark of Hong Kong action movies, and this 2003 documentary by Robin Shou honors the brave men (and the few women) who perform them. A stuntman-actor himself (Mortal Kombat), Shou elicits testimonials from old-timers (including Jackie Chan sidekick Sammo Hung, who prefers Hong Kong's production system to Hollywood's) and young Turks (who reveal tricks of the trade). He also does a brief, slapdash history of the physically demanding craft, which rose out of the Peking Opera, and he frequently cuts to scenes from one of his recent movies, adding to the impression that this is a vanity reel. In Cantonese with subtitles. R, 93 min.