This interesting kata is a focus of Shihan Wehrhahn's seminar in Hazelton this Sunday.  Health associations with Tai Chi Chuan are better known than with Karate, but Karate is indeed a supreme exercise for health. As with the Tai Chi form, even movements that look simple can be very beneficial - improving strength and balance, improving coordination, and stimulating the circulation of chi and blood.  Seiyunchin is said to condition the legs, which is easy to see in this video.  Also consider that the Bubishi, a prized martial arts text and the source of the name "Goju-Ryu" is half herbal text.