I read Tim's translation on Sun Lu Tang's book on A Study of Tai Ji Quan. And I have a few questions to ask, hopefully someone can help answer them.
1) On page 51 of the Author's Introduction, it says "The pre-heaven original qi slowly dissipates as the post-heaven qi slowly increases. The result is the weakening of the yang and a strengthening of the yin"
I don't quite get this as this sounds as though pre-heaven qi is has more yang and post-heaven qi has more yin ?? So the study of Tai Ji is to regain more yang to keep the yin/yang balance ?
2) Also in Tai Ji stepping, there is the 5-step. Advance, retreat, left, right and central. What happens to diagonal steppings ? Aren't these diagonal steppings important ?
1) Sun is emphasizing the fact that the pracitce of Taijiquan will increase your pre-natal or natural strength.
2) Stepping to a diagonal is a combination of going either forward or backward while simultaneously moving to the side.