Atlanta’s Best Fitness Classes and Luxury Gym. Our signature Group Classes feature a combination of HIIT cardio, strength, and core. All memberships include Open Gym access and Biocircuit – revolutionary guided circuit training machines. First gym in North America to offer Biocircuit. Experience all the Refinery has to offer with a one week free trial. Free trial includes unlimited Group Classes, Small Group Training, Open Gym, and Biocircuit.