Prayer of the Sick, the Unconscious, the Weak and the Infirm, the Elderly and Others

It was narrated from Humran ibn A'yan, from one of the Imams عليه السلام, who said: "My father عليه السلام when he prayed while sitting, he would sit cross-legged, and when he went into ruku' (bowing), he would fold his legs."