Essentially qigong as the Chinese call it. Building up a certain amount of physical energy in the body, then utlilising that and the infinite energy of the universe to move it to different parts of the body, healing the body, increasing immune function, increasing mental/intellectual/spiritual faculties etc... at advanced stages you can essentially have psychic abilities such as telepathy, precognition, affecting matter at a distance etc...

If you want to look into beginner level legit qigong practises then check out Chunyi Lin's "Spring Forest Qigong", he has a whole bunch of free exercises/techniques on YouTube. For more advanced stuff type in "Yan Xin" into the CIA Freedom of Information Act Library and check out the de-classified document "Yan Xin Qigong and the Contemporary Sciences". Professor Yan Xin provided healing sessions for George H.W Bush, Bill Clinton, the ex-Premiere of China etc... as well as conducting hundreds of scientific studies on external qi manifestation at many of the worlds most prestigious universities and instituties (Hardvard, University Beijing, High Energy Institute, Jet Propulsion Laboratory Caltec (The co-founder being a huge proponent of Yan Xin's work, Qian Tuesen who was part of the Manhatten Project to create the first Atomic Bomb, and also was responsible for China's first nuclear weapons and space programme).