Your understanding is a little wrong. Meridians are not channels like blood vessels. What we can't make sense is actually the irregularity inside the body. The gas you inhale must enter the lungs. When we talk about internal qi, we are more subjective exercise. For example, when we take a cold shower, we will involuntarily tighten our muscles and hold our breath. This is called hanging internal qi, but have you thought about meridians and abdomen? I don't think so. Therefore, qigong is not to cultivate things you don't have, such as Yuan Ying's Inner elixir, which is emotion, not material; Qigong guides more feelings and exercises.