Qi gong, a type of traditional Chinese medicine thought to be at least 4000 years old, is based on the belief that the human body contains a network of pathways through which vital energy called qi (also called chi) circulates. You may have heard this theory if you’ve ever had acupuncture. There are two main types of qi gong practice: internal and external. Internal qi gong is something you practise yourself using special meditation, subtle movement, visualisation, and breathing techniques. With the external type of qi gong, a practitioner projects qi into you with the aim of boosting circulation and improving overall health.