CrossFlowX™: Chest Opening Cardio Flow. 39 minutes. All day long, our shoulders round forward: in the car, if it's cold, on a computer, on a phone.... Our society promotes the rounding of our upper backs. This continual patterning closes off our chest, and has several ill effects on our bodies and minds. This cardio flow, clocking in just under 40 minutes, will help reverse all of that patterning, and OPEN your chest, allowing you to breathe deeper, calm your nervous system, and feel BETTER.