 In Ashtanga Vinyasa Yoga, Tadasana is performed on the toes, while Samasthitiḥ is flat footed.In this style of yoga the two āsanas are different.Samasthitiḥ is the centerpiece of the standing sequence and the foundation for the Hasta Vinyasas (arm vinyasas), Parsva Bhangi (side) vinyasas, Uttanasana (forward bending) vinyasas, and squatting/hip stretching asanas.