SB 11.28.38
yogino ’pakva-yogasya
yuñjatah kaya utthitaih
upasargair vihanyeta
tatrayam vihito vidhih
Translation:
The physical body of the endeavoring yogi who is not yet mature in his practice may sometimes be overcome by various disturbances. Therefore the following process is recommended.
Purport:
Having described the process of cultivating knowledge, the Lord now gives instructions to the yogi whose body may be disturbed by disease or other impediments. Those inferior yogis who are attached to the body and bodily exercises are often incomplete in their realization, and thus the Lord here offers them some assistance.