Lotus position discipline (4)
I believe the answer is:
yoga
'lotus position discipline' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yoga that I've seen before include "Hindu spiritual system" , "Hindu system of meditation and physical exercises" , "Hindu course of exercises and postures" , "(Hindu) mind and body toning" , "path to enlightenment" .)