The simplest approximation to our soul or spiritual dimension is by learning to pay careful attention to our breathing. It is important to mention that there is no "correct" or "incorrect" way of breathing.
When starting the process of paying attention to your breathing, there is a certain tendency to control it... DON'T. A great way to overthrow the anxiety to control it is by simply watching how your stomach rises as you breathe in, and flattens as you breathe out. Specifically, observe four fingers below your belly button where your "hara" is found.