Tadasana or mountain pose helps set the foundation for all the standing poses. It brings the body into the correct posture and alignment and it is important to learn this properly. The tadasana alignment is used in many other asanas so correct learning of it is vital for your asana practice.
Strengthens the legs
Elongates and stretches the spine
Stretches the arms in dynamic variation
Stretches the side of the body and the intercostal muscles in the dynamic variation
Improves focus and concentration
Brings clarity to the mind
Relaxes the mind