Previously, I had understood double weighed to simply mean having equal weight on either foot. However, lately and especially after my workshop with Chen Zhonghua, I now consider it as being in a position where one is unable to move [workshop double heavy exercise].
In the Chen Style Taijiquan Practical Method Volume One book, Hong Junsheng writes:
… These examples show that if the hand is solid then the foot must be empty [or the other way around]. If the front hand and foot are both solid, then the front foot cannot move freely.
In the video below, Chen Xiaowang discards the idea of 50-50 weight distribution and simply attributes double weightedness to mean “getting stuck”.
Perhaps this idea of 50-50 weight distribution meaning “double weighted” or “double heavy” is all just a big misunderstanding..