The Muscle Lab in Waltham Forest | Facilities, hours & reviews The Muscle Lab is a gym in Waltham Forest, offering gym and fitness facilities, strength and cardio training, membership enquiries. Address: Lea Rd, Waltham Cross, Waltham Abbey EN9 1ATOfficial 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