According to The Yoga Sutras of Patanjali, Hatha Yoga has eight limbs: yamas, niyamas, asana, pranayama, pratyahara, dhaurana, dhyana, and samadhi. One step leads to the next in this order, and each step will be practiced throughout life. All equally important and in balance with the others.
Yoga Asana means the physical postures we learn in class. When yoga asana is performed correctly, muscles are stretched and strengthened, and we find equanimity throughout our bodies. As our minds and bodies are connected the practice of yoga asana has major effects even without us noticing it at first. Because of this oneness our bodies will always reflect what the mind believes. This is how we have body language which goes much deeper than nodding your head and making eye contact. The way we hold our bodies through habit subconsciously radiates what we believe, and thus, what we continue to create in our lives in every moment.