Young Brunette Girl Doing Workout In The Fitness Gym

A gym which predominately or exclusively consists of free weights (dumbbells and barbells), as opposed to exercise machines, is sometimes referred to as a black-iron gym, after the traditional color of weight plates.
Cardio area/Theatre
A cardio theater or cardio area includes many types of cardiovascular training-related equipment such as rowing machines, stationary exercise bikes, elliptical trainers and treadmills. These areas often include a number of audio-visual displays (either integrated into the equipment, or placed on walls around the area itself) in order to keep exercisers entertained during long cardio workout sessions.