The Dan Tian or "Lower Heaven" is an important energy centre in the centre of the body, a few inches below the belly button. When the lower heaven is strong we will have good energy, a clear mind, and a strong immune system.
When your Dan Tian is strong, you will also have more benefit from your Qigong practice :)
Practice with Jeff in a beautiful stone courtyard while focusing on breathing into the lower heaven, and gently moving it throughout the body.
As an intermediate practice, this will leave you feeling strong, robust, and very connected to the subtle qi flow in the body.