KADENA AIR BASE, Okinawa — The Risner Fitness Center on Kadena Air Base is offering an eight-week Extreme Fitness Challenge class, according to a center announcement.

Registration begins at 5 a.m. Friday at Risner and will continue until all classes are filled. Classes will meet Monday through Friday beginning Monday and will finish March 9. Available class times are 5 a.m., 9 a.m., 10 a.m. and 4:30 p.m.

A personal trainer will run each class of 10 to 14.

For more information and costs, call Senior Airman Troy Dueling at DSN 634-5128.