The core bed can be set by adjusting the resistance of the spring, which can improve and reduce the difficulty of exercise, adapt to various fitness people, and design different training methods for different people. The reform bed, also known as the core bed, was invented by Pilates and is one of the most important exercise tools in Pilates. Reformer, also known as core bed, is mainly composed of bedstead, pulley, spring, foot bar and foot belt.