Cool.
I know it is ironic.
When your posture is right. Such as 2 feet apart about shoulder width. The whole body is relaxed. All you feel is the gravity pull from your feet or rooting.
Wu Ji Zhuang in Tai Ji Quan.
I placed my both hands near Dan Tien.
I feel a whole body pull. I do not resist.
Overtime, the Peng or whole body outward "tension" is developed in standing still practice.
By standing still and focusing on Dan Tien, we are using our whole body to "resist" or withstand the gravitational pulls from our Dan Tian to the whole body and the limbs.
Breathing is natural.