Its main functions are:
Stretch facial muscles to prevent and slow down wrinkles;
Relieve the discomfort of ears, nose and throat;
Beneficial to eyes, thyroid gland and glands of neck, eyes and ears;
Stretch and strengthen the tongue and massage the throat;
Enhance blood circulation in the throat and prevent colds;
Strong lungs.
There are more postures to exercise your arms. You can buy a "Basic Posture and Techniques Raiders" or a three-disc set of "Simple Series" necessary for beginners, which is also very good and the explanation is very clear.