Ugrasana is one of the significant Yoga asanas of Lord Shiva according to the Shiva Samhita, a classical yoga text. The Shiva Samhita describes the posture as one of the first four (and most important) asanas taught by Lord Shiva, although other texts do not group it in the same category. However, Ugrasana does have a history dating back at least a 1000 years, considering it is nearly identical to the Paschimattana, recorded first in the Hatha Yoga Pradipika (1400 AD). It is considered a more challenging variant of the same.