Verse 78

मृद्वासने स्फिजैकेन हस्तपादौ निराश्रयम् ।निधाय तत्प्रसङ्गेन परा पूर्णा मतिर् भवेत्

In plain words

On a soft seat, resting on one buttock, place the hands and feet resting on nothing; through this your understanding becomes supreme and complete.