Castlereagh Gym Directory. Click here for a comprehensive list of gyms, health clubs and fitness centres in Castlereagh New South Wales. Looking for a suitable gym, health club, fitness centre, recreation centre or aquatic centre close to home or work? Click here for Australia's leading gym directory, the Good Gym Guide. Castlereagh Gyms, Health Clubs, Fitness Centres and Personal Trainers. Penrith NSW. Castlereagh Gym Directory Australia. Castlereagh.