Tadasana

Tāḍāsana is from the Sanskrit words ताड tāḍa, "mountain" and आसन āsana meaning "posture" or "seat".

[9] It is used in some schools of yoga in between other poses, to allow the body and consciousness to integrate the experience of the preceding asana and to prepare for the next.

[10] Placing the feet wider is common in vinyasa styles of yoga and provides a more stable base in this and other such standing asanas.

[16] An extreme form of the pose is Tiryang Mukhottanasana, in which the back bend is sufficient to enable the hands to grasp the ankles.

It teaches practitioners to balance the weight equally on the two feet.The feet are placed together, the shins and thighs are aligned, and the chest is lifted.

[22] In this school of yoga, Tadasana is the beginning and ending asana in the warm-up Surya Namaskar sequence.

It is sometimes interspersed throughout Ashtanga Series when full vinayasas are used, and it is the foundational pose for all standing asanas.

Tadasana or Mountain pose
Variations include the side bend Indudalasana, one of the asanas sometimes called Half Moon Pose .
Standing in a back bend gives the Standing Locust Pose, Stiti Shalabhasana .