This is one posture I really like, many of my students don’t share my enthusiasm for this posture and it is a hard one. What I like about it is the nice stretch along the side trunk and the stretch of your hips and leg when you really press into the outer edge of the back foot.
To start stand in Tadasana jump or step your feet apart, make sure you are wide enough, feet parallel, arms out at shoulder height, pull up at the knee caps and tuck the tailbone in, turn the left foot in slightly and the right foot in compleatly, heel inline with the instep. Hips and trunk facing forward, bend the right leg to 90 degree, placing the right hand at the outside of the ankle, ( make sure the knee don’t over shoot the ankle) if chest facing the floor use a brick. Left hand on the hip, turn the trunk and raise the right arm up, keep pressing into the outer edge of the back foot, turn the arm and bring it over head, stretch into the fingertips at the same time you press the outer edge of the back foot into the floor and you’ll feel a lovely stretch along the side trunk and hip area and other places depending on where your tight areas are.
If you haven’t practice for a few days or if you have done other activities like running/horse riding etc you can really feel how the muscle stretch. In the beginning we tend to not bend the leg enough but it will be easier to hold the pose and maybe in the beginning your body isn’t open enough so you just have to work with what you have, but we tend to stay in our comfort zone, so challenge yourself go a bit deeper but not forcing, be kind to your body but not to kind…đ