Cupping is a traditional method that has been used by many different cultures in history. It involves placing a glass or silicone vacuum cup on the skin that gently stretches the skin and fascial tissue to encourage release of toxins from the tissue and loosening and softening of the muscles and fascial network. Essentially, cupping is the inverse of a massage, as instead of pushing the tissues in, it pulls them up and encourages them to unwind and release tension.
Cupping is most often used for muscle pain and tension, but is also great for the lungs. It can clear congestion from colds and flus, dredge up stuck phlegm that builds up in the lungs from regular smoking, and can even help to control a person's asthma.
It is common for cupping therapy to leave bruises on the body, but these bruises are actually a good thing: it means that stagnation has been brought to the surface so that the body can address it. While your body works to heal the bruises, it means more of its attention is on the area of stagnation which has a deep and lasting positive impact on the area the practitioner is treating.