A brief video showing various stages of development for the legs in Taijiquan. This is specific to the Yang family style of Taijiquan and should take most practitioners around 7-8 years of practice before they are able to move through these stages to distinguish full and empty.
The footage was taken from a small course held in Portugal in April 2016. Hopefully some of this information will be helpful to Yang style Taiji practitioners out there.
The six stages discussed in the video are as follows: