To get the most out of your practice you'll want to begin digging into the non-movement aspects of yoga like the breath and meditation. Chakras are one of these "subtle" tools of yoga that make a big difference over the long haul. While you'll get an impact whether you know what is happening or not - it is helpful to understand how our "energy body" responds to the physical practice of yoga and how that is of benefit in finding less suffering and more joy.