LAKE PLACID Olympic Center Tumbling returns to the to the Lussi Rink beginning Wednesday, Oct. 1. During these weekly sessions, youngsters 18 months to 14 years of age will be introduced to tumbling and basic gymnastics skills. Olympic Center Tumbling will be offered Oct. 1, 8, 22, 29, Nov. 5, 12 and 19. Adults are asked to register by calling the Olympic Center Box Office at 523-3330. Classes will be offered in the following groups: Tiny Tots for children 18 months to two years of age, with parents (45 minutes in length) Tots will be for kids two to three and a half years of age, with parents (45 minutes) Kinder Gym is for children three and a half to five years of age (1 hour) Wiggle and Roll is for five to eight year olds (1 hour) Flips is presented for nine to 14 year olds (1 hour) Cost for the seven-week session is $55 per child for Tiny Tots and Tots. Kinder Gym, Wiggle and Roll, and Flips cost $75 per child.