How can chi gung be used by the seriously ill?

Western exercise utilizes either motion or resistance to motion to strengthen the body (for example, weight lifting, calisthenics, running). Unfortunately, the seriously ill and bedridden often do not have the capacity for vigorous exercise. This means that the muscles and organ systems get weaker during prolonged bed rest, and it may take months to get back to normal after recovery from the main problem (a back injury, say). Chi gung, however, has many techniques specifically designed for the weak and immobile, techniques that increase physical capacities without requiring strenuous movement. In China, chi gung is also prescribed for terminal cancer patients as a last resort. If they don't initially have the strength to practice while standing or sitting, they practice lying down until their strength builds up.