No1 Fitness The City is located on St Mary Axe, in South-East London (SE1). The gym hosts a whole spectrum of fitness classes, working on a class only basis, with 30-minute sessions, kept to small personal groups of six. Sessions are available for all levels and abilities. Choose from strength, cardio to boxing and so much more! Open Monday to Friday from 6am to 9pm, 8am to noon on Saturdays and from 10am and from noon on Sundays. The closest tube stations are Liverpool Street, Aldgate and Bank, all a 5 to 10-minute walk away.