Śrīmad-Bhāgavatam · Text 11.28.41
Who is speaking and story frame
केचिद् देहमिमं धीरा: सुकल्पं वयसि स्थिरम् ।
विधाय विविधोपायैरथ युञ्जन्ति सिद्धये ॥ ४१ ॥
kecid deham imaṁ dhīrāḥ
su-kalpaṁ vayasi sthiram
vidhāya vividhopāyair
atha yuñjanti siddhaye
By various methods, some yogīs free the body from disease and old age and keep it perpetually youthful. Thus they engage in yoga for the purpose of achieving material mystic perfections.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.