Four variations in neck movements are prescribed.
Here is what Mr. Santosh Kumar has to say about Greeva Bhedas
Sundari cha tiraschinaa tathaiva parivarthitha
Prakampitha cha bhavagnair gneyaa greeva chathurvidhaa
- Sundari – Moving neck from side to side (atami in general terms)
- Therashchinaa – Moving neck up and down in atami like the gliding of a snake
- Parivarthitha – Moving neck from right to left like a half moon
- Prakampitha – Moving neck front and back like bird/ pigeon