Warrior one, Virabhadrasana A, is one of the fundamental poses. This pose strengthen your whole body and it is a great pose to understand your muscle engagement. We will sit in this pose for a while to explore our muscle engagement and the alignment today. Your pelvic girdle is facing forward in this pose to allow the internal rotation of your hips. In this movement , you engage your both quadriceps on front and back legs, gluteus maximus, tensor fascia lata (muscles that run with IT band), hamstrings, gastrocnemius,and ilopsoas muscles. Put equal weight on both right and left leg. There is a tendency that your front leg has more emphasis than your back leg, so ensure to keep your straight leg active and strong. Your upper body is also active. Your latissimus dorsi and also your muscles around your ribs called serratus anterior are engaged to keep your back long. These muscles will help you to keep you ribs from sticking out to the front. Let your triceps to face forward and draw your shoulders down.