“An asana is not a posture which you assume mechanically.It incolves thought, at the end of which a balance is achieved between movement and resistance.” B.K.S.Iyengar
Standing asanas strengthen the leg muscles and joints, and increase the supplensess and strenght of the spine.Owing to the rotational and flexing movements,the spinal muscles and inter-vertebral joints are kept mobile and well-aligned.The arteries of the legs are stretched,increasing the blood supply to the lower limbs,and preventing thrombosis in the calf muscles.These asana also tone the cardio-vascular system.The lateral wall of the heart is fully stretched,increasing the supply of fresh blood to the heart.
In addition standing poses have elements of all the other poses;you can bend forward,back and to the side.You can twist,balance and even go upside down.As stretched out postures,they utilize large muscles,warm the bodyat the start of your practice and also develop stamina.Standing postures demand involvement from the whole body.
While they make you stronger and more flexible,they have an integrating force. Just as life,without a steady foundation in these postures,you will never be able to extend to reach your maximum. Standing poses teach you about firm grounding, and only from there can you radiate outward,blossoming to reach your full potential.