On1 Fitness in Merton | Facilities, hours & reviews On1 Fitness is a gym in Merton, offering gym and fitness facilities, strength and cardio training, membership enquiries. Address: 10 Morden Hall Rd, Morden SM4 5JFOfficial website Things to do today Things to do tomorrow This weekend Free events Family events Kids activities in London Live music in London Live sports in London Cinemas in London Gyms in London All London events