One verse

Srimad Bhagavatam 4.8.76

4.8.76

पञ्चमे मास्यनुप्राप्ते जितश्वासो नृपात्मज: । ध्यायन् ब्रह्म पदैकेन तस्थौ स्थाणुरिवाचल: ॥ ७६ ॥

pancame masy anuprapte jita-svaso nrpatmajah dhyayan brahma padaikena tasthau sthanur ivacalah

pancame
in the fifth
masi
in the month
anuprapte
being situated
jita-svasah
and still controlling the breathing
nrpa-atmajah
the son of the King
dhyayan
meditating
brahma
the Supreme Personality of Godhead
pada ekena
with one leg
tasthau
stood
sthanuh
just like a column
iva
like
acalah
without movement.

By the fifth month, Maharaja Dhruva, the son of the King, had controlled his breathing so perfectly that he was able to stand on only one leg, just as a column stands, without motion, and concentrate his mind fully on the Parabrahman.