A recliner for variable adjustment between a substantially horizontal position and an ergonomic seating position includes right-hand and left-hand side parts, which are each made up of an outer side part and an inner side part. The recliner also comprises a backrest element and a seat-surface element, which are connected to one another for rotation via a first bearing rod, as well as a foot-part element, which is connected to the seat-surface element for rotation via a second bearing rod. The foot-part element is mounted between the right-hand and left-hand side parts via a third bearing rod. The first, second and third bearing rods are each mounted for translatory movement in a corresponding guide in the right-hand and left-hand side parts such that the backrest element, the seat-surface element and the foot-part element can be adjusted in a variable manner between a substantially horizontal position and an ergonomic seating position.