Astanga Hrudaya
सहजं कालजं युक्तिकृतं देहबलं त्रिधा। तत्र सत्त्वशरीरोत्थं प्राकृतं सहजं बलम्॥७७॥
Trividha Bala – three kinds of strength: Are the three kinds of strength of the body among them, sahaja is that which is due to satvaguna, body having excellence of all the tissues (body having excellence of all the tissues and of the mind) and which is natural (born with, innate to the body);
english translation
sahajaM kAlajaM yuktikRtaM dehabalaM tridhA। tatra sattvazarIrotthaM prAkRtaM sahajaM balam॥77॥
hk transliteration by Sanscript