Tadasana, also known as Mountain Pose or Samasthiti, is a standing asana in modern yoga as exercise. It is considered to be the blueprint that forms the basis of all other standing postures. The name Tadasana is derived from two Sanskrit roots; tada, meaning "mountain" and asana meaning "seat" or "posture".

To practice Tadasana, one stands with their feet together, grounding evenly through the feet and lifting up through the crown of the head. The thighs are lifted, the waist is lifted, and the spine is elongated. The breathing is relaxed. Tadasana is both physically and mentally grounding and can be used as a means of promoting stability in body and mind.

Tadasana is the starting and finishing position of all Sun Salutation sequences, in addition to its use as a resting pose between other more strenuous postures. It is the cornerstone of the standing poses and is used in between standing poses as a physical barometer, a place of return where one can quietly assess how the body feels after a preceding asana.

Some benefits of Tadasana include correcting muscle imbalances, improving posture, and deepening awareness. It can also relieve sciatic pain, improve agility, boost circulation, tone core muscles, and strengthen the back, hips, and legs. Tadasana may be useful in treating health conditions such as Parkinson’s disease and Ankylosing spondylitis (AS).

Modifications for Tadasana include using a chair to do seated Tadasana, which improves posture and builds core strength, and using props such as blocks or a wall to help align the body.