. . . "It was also part of a New Year's resolution.???The club targets the 89 percent of the public who do not frequent gyms, Huling said, adding that ???other gyms will fight over the other 11 percent.??? Armed with a ???Lunk Alarm,??? Planet Fitness staff members sound a siren when a member breaks club rules either by grunting or dropping weights during a workout.The heaviest dumbbells are only 60 pound" .