Natyashastra
पृष्ठतो वलितं पादं शिरोघृष्टं प्रसारयेत् । सर्वतो मण्डलाविद्धं विद्युद्भ्रान्ता तु सा स्मृता ॥ ४०॥
Vidyudbhrāntā—one foot turned to the back and after touching its top part to be stretched, and the head moved in a circle.
english translation
pRSThato valitaM pAdaM ziroghRSTaM prasArayet । sarvato maNDalAviddhaM vidyudbhrAntA tu sA smRtA ॥ 40॥
hk transliteration by Sanscript