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1. An air mattress, adapted to be selectively inflated or deflated by an air source controlled by a control system, the air mattress comprising: at least one first air cell at a head end of the air mattress; a second air cell disposed adjacent to the at least one first air cell and comprising a first air chamber, a second air chamber, and a structurally-weakened region, wherein the structurally-weakened region is a hollowed-out region, wherein the first air chamber is adjacent to the second air chamber, and the structurally-weakened region is enclosed in the second air cell; a plurality of third air cells adjacent to the second air cell without directly contacting the at least one first air cell; and a body-lifting air cell substantially at a lower position of the second air cell and at least one of the third air cells, wherein when the air mattress is in use, the air source inflates the body-lifting air cell to lift the second air cell and the at least one of the third air cells, and a vertical distance between a top of the second air cell and a bottom of the air mattress is a first distance, and a vertical distance between a top of the at least one first air cell and the bottom of the air mattress is a second distance, and the first distance is greater than the second distance, wherein the structurally-weakened region enclosed in the second air cell has a lower structural strength than that of any of the other air cells forming the air mattress when the air mattress is in use achieving a cushioning effect of the second air cell against external forces applied to an upper supporting surface of the air mattress, and wherein the structurally-weakened region has an opening that does not face the direction of the external forces, so as to achieve the cushioning effect of the second air cell against the external forces.
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