This is ALWAYS the most popular topic. Its about the tenth time its been discussed in this forum. There are some other great threads on it in here...
I guess its something everyone deals with, and there are always lots of questions.
Dr. Yang defines Jing as the hormones, neurotransmitters, genetic material, and other chemistry in the body. You inherit pre-birth essence from your parents, and it is said that you cannot change it on a deep level. on the other hand, it is likely that if you are extremely healthy mentally and physically, and have a dedicated meditation/qigong practice, that you CAN improve your chemistry and your genes so that they are improved - closer to optimum health - and then the Jing you pass on is "improved" over that of your parents.
In discussion w Dr Yang about this he suspects also that this is true.
Any genetic scientists in here? Let's get some experts into the discussion!
Otherwise, wouldn't humans continually degrade until we are incredibly unhealthy and weak?
Case in point: Lance Armstrong's parents are not superhumanly physically fit. But lance has trained his entire life and has become a superhuman badass. I predict his children will inherit his improved genes/etc/Jing and will be 'pre-disposed' to being unusually healthy.
I'll report back in 15 years when his son (or daughter?) wins the Tour de France.