According to Chinese medicine, the genes are considered the essence of your being. This essence is responsible for the production of hormones, from which Qi is generated. When this Qi is led to the brain, the spirit is raised. When all of these conversion processes are functioning normally, the immune system is strong and sickness is less likely. One of the main goals of Qigong is learning how to convert the essence into Qi efficiently and lead it to the brain.
Weak joints can come from heredity or from lack of exercise.
The body is a living machine, so the more you use it, the better condition it will be in. Chinese medicine believes that even if you have inherited a weak joint it is still possible to strengthen it through Qigong. When you exercise, Qi is brought to the joint by the movement of the muscles and tendons. This will nourish the joint and rebuild it. According to today's medicine, some forms of arthritis are caused by injury to the joints.