One Tree Hill Gym Directory. Click here for a comprehensive list of gyms, health clubs and fitness centres in One Tree Hill South Australia. 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. If you searched for One Tree Hill Gyms, One Tree Hill Fitness Centres, One Tree Hill Health Clubs or One Tree Hill Recreations Centres then your on the right page.