Reddit mentions of The Tao of Meditation: Way to Enlightenment

The catch is you have to spend your whole life training and meditating to develop to a level anywhere close to chang's.

If your interested there are several resources I recommend. Spring forest qigong is a great place to start for basic concepts, robert bruce is a great author on energy work, there was a book called the tao of meditation written in the 80's which describes training similar to changs.
http://www.amazon.com/Tao-Meditation-Way-Enlightenment/dp/0804814651/

Taoist Yoga: Alchemy and Immortality
https://www.amazon.com/Taoist-Yoga-Kuan-Charles-Luk/dp/0877280673

Internal Elixir Cultivation: The Nature of Daoist Meditation
https://www.amazon.com/Internal-Elixir-Cultivation-Nature-Meditation/dp/1943155135/ref=sr_1_2?s=books&ie=UTF8&qid=1478006245&sr=1-2&keywords=internal+elixir+cultivation

Healing Light of the Tao: Foundational Practices to Awaken Chi Energy
https://www.amazon.com/gp/product/1594771138/ref=pd_sim_14_3?ie=UTF8&psc=1&refRID=2P7K1FW99QSDG12HVPZA

Foundations of Internal Alchemy: The Taoist Practice of Neidan
https://www.amazon.com/gp/product/0984308253/ref=pd_sim_14_2?ie=UTF8&psc=1&refRID=5KF0N4TFRQQQ4PCVCH6F

The Tao of Meditation: Way to Enlightenment
https://www.amazon.com/gp/product/0804814651/ref=pd_sim_14_25?ie=UTF8&psc=1&refRID=5KF0N4TFRQQQ4PCVCH6F