The purpose of this study was to explore the process of cultivating energy in middle-aged women doing Dan Jeon Breathing and to develop a grounded theory of Dan Jeon Breathing.

Data was collected by means of an in-depth interview using tape-recordings from 15 participants who practice Dan Jeon Breathing. The data was analyzed using the grounded theory method proposed by Strauss and Corbin(1998).

The core category was identified as "cultivating energy of the mind and the body together". The process of this could be further divided into 4 stages: the stages are cessation of an 'energetic life', 'depending on Dan Jeon Breathing', 'going through a difficult practice process' and 'getting used to Dan Jeon Breathing'. The participants began Dan Jeon Breathing because they were unable to retain their energetic lifestyle. They were dependent on Dan Jeon Breathing for recovery of health. Also, they were going through a difficult process. Finally, they entirely approved of Dan Jeon Breathing as a method of health promotion.

This study provided the understanding needed for the training process of Dan Jeon Breathing. Therefore, women can pursue Dan Jeon Breathing for their health.