Siddhāsana, Padmāsana, Siṃhāsana, and Bhadrāsana are the four best. Of these, Siddhāsana is supreme and bestows siddhi.

This verse reiterates the hierarchy of postures established earlier, adding an important detail: Siddhāsana is siddhidam — “bestower of siddhi.”

The siddhis are yogic powers or perfections. They include extraordinary capacities such as:

• Clairvoyance and clairaudience
• Control over the elements
• Knowledge of past and future
• Levitation and other physical powers

More importantly, siddhi can refer to spiritual perfection, the realization of the Self. In this sense, Siddhāsana leads directly to the ultimate goal of yoga.

Param — “supreme” — unequivocally establishes that Siddhāsana stands above all other postures. This does not mean the others are useless, but rather that if the practitioner could master only one, it should be this.

The very name of the posture (siddha + āsana = posture of the perfect/adept) indicates its connection with yogic perfection.