Abstract: The technical result of the claimed design consists in maintaining the physiological curvatures in the neck and lumbar parts of the spine, under the “healthy back” principle. The technical result is achieved in a bicycle that comprises a frame provided with handlebars pivoted thereon, wheels, a pedal mechanism, and a seat with a backrest, the seat backrest being provided with vertically movable pads and having a variable angle of inclination to the seat, the pads having a constant or variable volume, and the handlebars having a position that can be varied vertically and horizontally and a variable angle of inclination to the seat.

Abstract: The technical result of the claimed utility model consists in the maintenance and retention of the natural physiological curvatures of a person's spine while said person remains in the chair. The technical result is achieved in a vehicle chair that comprises a seat having a backrest and headrest, the backrest being provided with a pad capable of moving vertically and horizontally at the level of the lumbar part of the person's spine, the headrest being capable of varying its vertical position and its angle of inclination to the horizontal and being provided with a pad in the area of the neck part of the headrest, said headrest pad being movable vertically; the backrest being capable of varying its angle of inclination to the horizontal; and the pads having a constant or variable volume.