By Ralph Novak
November 28, 1988 12:00 PM

Kids, don’t try any of these skateboarding stunts at home. Don’t even try them down at the mall or in the school parking lot, for that matter. If you really have to do this kind of stuff, confine it to your padded cell. Most of this half-hour tape is devoted to insufferable teenage skateboarders whose obsession with being cool suggests nerds in punks’ clothing. (Actually, most of them are in clothing ostentatiously bearing the name of a sportswear manufacturer that is a sister company of the outfit that produced the tape.) Mark “Gator” Rogowski, for instance, sneers, “If somebody came up to me and said, ‘Grow up and get a real job,’ you know what I’d tell ’em: ‘Get back on your ice-cream bicycle, jerk, and sell on the other street.’ ” Overshadowed is the considerable athleticism displayed by many of these boys (only one girl appears, in a very tame sidewalk routine). That’s especially evident in the formal skateboarding arenas, where the competitors roll from side to side, doing all sorts of complicated flips and spins on what looks like about 10 bowling lanes attached side-by-side and bent into a giant U. For reasons known only to himself, Brian Gillogly wrote the tape’s narration in the form of an uninspired parody of Rod Serling’s Twilight Zone introductions. A potentially more serious problem is that many of the skateboarders are shown performing without helmets in such menacing places as an empty swimming pool with sloping sides. (Unreel, $14.95; 714-972-9777)