Why does Lord Vishnu remain in resting posture? Why not sitting on a Throne?
As soon as the attention of Lord Vishnu, the maintainer of the universe, comes, a picture appears in the heart. Lord Shri Hari Vishnu is in rest posture and Mata Lakshmi is sitting near his feet. While the rest are mostly seen seated on the Lord's throne and the Goddess sits with Him on the same throne. The question is why Lord Shri Hari Vishnu always remains in rest posture. Whereas maintaining the creation is an important task.
Lord Shri Hari Vishnu has been told in detail in the scriptures. I will talk here in simple words. It is known to all that the abode of Lord Vishnu is in Ksheer Sagar. His court does not take place. Sheshnag is the seat of Lord Vishnu. He is not an inanimate object but is the cause of the balance of the universe. Lord Vishnu, seated on Sheshnag in Kshir Sagar, holds conch shell, chakra, mace and padma in his four hands. His conch shell is called 'Panchjanya'. The wheel is called 'Sudarshan', the mace is called 'Kaumodaki' and the gem is called 'Kaustubh'. Lord Vishnu is eternal. This is his yoga posture. That is, Lord Vishnu is most active in this posture. For those who do not know about it, the sight of Lord Vishnu's Sadyogi posture creates an illusion of relaxation.
His devotees like to see Lord Vishnu in the Sadyogi posture. Because this is the most active state, but the Lord is seen standing in the second most prevalent posture of Lord Vishnu. Sri Satyanarayana Bhagwan and Lord Venkatesh appear in a standing posture on the Tirumala mountain. Apart from this, in Paramapadnath and Totadri posture, Lord is seen sitting on the throne. But just as a king is active on the throne and his darshan is graceful, similarly Lord Vishnu is always most active in the yogi posture and his darshan with Goddess Lakshmi is considered to be beneficial.