Nautilus of Marin 1530 Center Rd, Novato, CA94947 Nautilus of Marin is a fitness center that lets you try out the first three days for free. It has plenty of free…More weights, machine weights, circuit training, step mills, elliptical machines, exercise bikes and treadmills available. Nautilus also has open court basketball and volleyball, as well as group exercise classes and spin classes. If you are looking for a personal trainer, it offers a one hour free consultation, as well as a thirty minute free personal training review. The gym also provides physical therapy to its customers with an appointment.