Massage chairs work by utilizing a combination of mechanical devices, motors, and rollers to mimic the techniques and movements of a professional massage therapist. These chairs are designed to provide a variety of massage techniques, such as kneading, rolling, tapping, and shiatsu, to help relax muscles, improve circulation, and reduce stress.

The basic components of a massage chair include:

1. Motors: These are the driving force behind the movement of the massage chair. Motors are used to power the rollers, airbags, and other components that provide the massage experience.

2. Rollers: Rollers are typically located in the backrest of the chair and are used to mimic the movements of a massage therapist's hands. These rollers move up and down, side to side, and in circular motions to provide a variety of massage techniques.

3. Airbags: Airbags are often located in the seat, back, and leg rest of the chair. These airbags inflate and deflate to apply pressure to different parts of the body, helping to improve circulation and relieve muscle tension.

4. Heating elements: Some massage chairs are equipped with heating elements that provide warmth to the muscles during the massage. This can help to further relax and soothe sore muscles.

5. Control panel: Most massage chairs come with a control panel that allows users to adjust the intensity, speed, and type of massage they receive. Some chairs also come with pre-programmed massage settings for different needs, such as relaxation, deep tissue, or shiatsu massage.

When a person sits in a massage chair and selects a massage program, the motors, rollers, airbags, and heating elements work together to provide a customized massage experience. The rollers move up and down the back, kneading and rolling out tension in the muscles. The airbags inflate and deflate to apply pressure to different areas of the body, such as the shoulders, arms, and legs. The heating elements provide soothing warmth to help relax the muscles further.

Overall, massage chairs are designed to provide a convenient and effective way to receive a therapeutic massage in the comfort of your own home. By using a combination of mechanical devices and advanced technology, these chairs can help to improve circulation, reduce muscle tension, and promote relaxation for a truly rejuvenating experience.