Natyashastra
गमनेन निषण्णः स्यादन्येन चरणेन तु । इतरेण निषीदेच्च क्रमेणानेन वै व्रजेत् ॥ १३४॥
In walking, one should sit down (lower the body) on one foot and rest on the other; by alternately setting the feet in this manner, the movement (gait) should be performed.
english translation
gamanena niSaNNaH syAdanyena caraNena tu । itareNa niSIdecca krameNAnena vai vrajet ॥ 134॥
hk transliteration by Sanscript