महाभारतः mahābhārataḥ - book-13, chapter-130, verse-10

वीरासनगतैर्नित्यं स्थण्डिले शयनैस्तथा ।
शीतयोगोऽग्नियोगश्च चर्तव्यो धर्मबुद्धिभिः ॥१०॥

10. vīrāsanagatairnityaṁ sthaṇḍile śayanaistathā ,
śītayogo'gniyogaśca cartavyo dharmabuddhibhiḥ.

10. vīrāsana-gataiḥ nityam sthaṇḍile śayanaiḥ tathā
śīta-yogaḥ agni-yogaḥ ca cartavyaḥ dharma-buddhibhiḥ

10. By those who always assume the hero's posture (vīrāsana) and by those who sleep on bare ground; similarly, the practices (yoga) of enduring cold and enduring fire should be undertaken by those with an understanding of natural law (dharma).

Words meanings summery:

• वीरासन-गतैः (vīrāsana-gataiḥ) - by those who always assume the hero's posture (vīrāsana) (by those who have attained the hero's posture)

• नित्यम् (nityam) - always, consistently (always, constantly, perpetually)

• स्थण्डिले (sthaṇḍile) - on the bare ground (as an austerity) (on bare ground, on an uncovered spot)

• शयनैः (śayanaiḥ) - by those who lie down (to sleep) (by those who sleep, by beds)

• तथा (tathā) - and similarly, also (so, thus, in that manner, also, similarly)

• शीत-योगः (śīta-yogaḥ) - the practice (yoga) of enduring cold (as an austerity) (cold yoga, practice of cold)

• अग्नि-योगः (agni-yogaḥ) - the practice (yoga) of enduring fire or intense heat (as an austerity) (fire yoga, practice of fire)

• च (ca) - and (and, also)

• चर्तव्यः (cartavyaḥ) - should be practiced or observed (to be practiced, to be performed, to be done)

• धर्म-बुद्धिभिः (dharma-buddhibhiḥ) - by those whose intellect is directed towards natural law (dharma) (by those whose intellect is dharma, by those having a dharma mind)

Words meanings and morphology

वीरासन-गतैः (vīrāsana-gataiḥ) - by those who always assume the hero's posture (vīrāsana) (by those who have attained the hero's posture)

(adjective)

Instrumental, masculine, plural of vīrāsana-gata

vīrāsana-gata - having assumed the hero's posture

compound

Compound type : tatpurusha (vīrāsana+gata)

• vīrāsana – hero's seat/posture, a specific meditative posture (vīrāsana)
  noun (neuter)
• gata – gone, attained, arrived at, being in
  adjective (masculine)
  Past Passive Participle
  from gam + kta
  Root: gam (class 1)

नित्यम् (nityam) - always, consistently (always, constantly, perpetually)

(indeclinable)

accusative singular of nitya used adverbially

स्थण्डिले (sthaṇḍile) - on the bare ground (as an austerity) (on bare ground, on an uncovered spot)

(noun)

Locative, neuter, singular of sthaṇḍila

sthaṇḍila - bare ground, an uncovered spot for religious purposes

शयनैः (śayanaiḥ) - by those who lie down (to sleep) (by those who sleep, by beds)

(noun)

Instrumental, masculine, plural of śayana

śayana - sleeping, lying down; a bed, couch

from śī + lyuṭ

Root: śī (class 2)

Note: Often used for 'those who sleep' in plural instrumental

तथा (tathā) - and similarly, also (so, thus, in that manner, also, similarly)

(indeclinable)

शीत-योगः (śīta-yogaḥ) - the practice (yoga) of enduring cold (as an austerity) (cold yoga, practice of cold)

(noun)

Nominative, masculine, singular of śīta-yoga

śīta-yoga - practice of cold, yoga of enduring cold

Compound type : tatpurusha (śīta+yoga)

• śīta – cold, cool, chilled
  adjective (neuter)
  Past Passive Participle
  from śyā + kta
  Root: śyā (class 4)
• yoga – yoga, union, spiritual discipline, posture
  noun (masculine)
  from yuj + ghañ
  Root: yuj (class 7)

अग्नि-योगः (agni-yogaḥ) - the practice (yoga) of enduring fire or intense heat (as an austerity) (fire yoga, practice of fire)

(noun)

Nominative, masculine, singular of agni-yoga

agni-yoga - practice of fire, yoga of enduring fire/heat

Compound type : tatpurusha (agni+yoga)

• agni – fire, god of fire
  noun (masculine)
  Root: ag (class 1)
• yoga – yoga, union, spiritual discipline, posture
  noun (masculine)
  from yuj + ghañ
  Root: yuj (class 7)

च (ca) - and (and, also)

(indeclinable)

चर्तव्यः (cartavyaḥ) - should be practiced or observed (to be practiced, to be performed, to be done)

(gerundive)

धर्म-बुद्धिभिः (dharma-buddhibhiḥ) - by those whose intellect is directed towards natural law (dharma) (by those whose intellect is dharma, by those having a dharma mind)

(adjective)

Instrumental, masculine, plural of dharma-buddhi

dharma-buddhi - intellect directed to dharma, wise in dharma

Compound type : bahuvrihi (dharma+buddhi)

• dharma – dharma, constitution, natural law, righteousness, duty
  noun (masculine)
  from dhṛ + man
  Root: dhṛ (class 1)
• buddhi – intellect, understanding, discernment
  noun (feminine)
  from budh + kti
  action noun
  Root: budh (class 1)