Abstract: A seat includes a seat portion connected to a base so that it can be supported on the ground. In addition to a front, a rear and two sides, the seat portion has an upwardly inclined portion, an inclined support portion, and a substantially flat horizontal portion. The upwardly inclined portion inclines upwardly from the front of the seat portion to a first intermediate position between the front and rear of the seat portion. The inclined support portion extends between a second intermediate position and the rear of the seat portion. The horizontal portion extends from the first intermediate position to the second intermediate position. The upwardly inclined portion supports the femurs and knees in a position below a person's acetabulum. The horizontal portion receives and holds the ischial bones when the person sits down, and the inclined support portion supports the gluteal muscles and sacra iliac ligaments.

Abstract: A seat having a base and a seating section. The seat section has an upwardly inclined portion, a substantially horizontal portion and an inclined support portion. The inclined portion supports the femurs of a person so that the femurs and knees are supported in a position below the person's acetabulum, the horizontal portion receives and holds the ischial bones and the inclined portion supports a person's gluteal muscles and sacro-illiac ligaments. The seat has a backrest to support a person between the second and third lumbar vertebrae when a person is seated on the apparatus. The backrest has a support surface which is positioned between the rear of the seat and the first intermediate positions so that the person's gluteal muscles can extend behind the support surface between the rear of the seat portion and the support surface of the backrest.