Kodoninja

I practice Wu style Taiji from a Wu Tu Nan lineage as well as Yu Xian Pai Neidan and between that and Zhan Zhuang… some days it’s hard to do both. I have also noticed I have to space out the Taiji Qigong(from Wu Tu Nan) with some of the Neidan methods by several hours. And the Taiji I also have to watch out for certain hours of the day because it’s much more activating. So I would say it depends on the systems you are practicing. Some methods mesh well together and can get a boost from other methods. While some other methods would directly conflict with each other and could cause you to go out of balance(into deviation). You’re better off gaining the experience with one system so you can manage your own state and Yin/Yang balance before incorporating other systems/methods.

My Taiji shifu who is from a Wu Tu Nan Wu lineage said that the Dantian is just the center of gravity. So if we’re talking about Taiji, a person with a Dantian is someone who is always rooted and has the ground. From doing Wuji standing for long periods, an opposing force starts to lift up your body. Then yang qi from above starts to properly move and align down into the body and mixes with the yin qi. Then if you’re speaking about Neidan, a Dantian is when someone who has the elixir (golden pill or embryo) in their lower reservoir. This implies that the practitioner is at the stage of Di Xian or close to it. So an actual Dantian is not exceptionally rare and doubt anyone here has one. I certainly don’t have one(if we’re talking about the pre-Heaven).