A profiling bed or similar support surface having a back section, seat section, thigh and calf section convertible to a chair configuration. The back section is mounted on an angled slide to retract as it is rotated. The angle of the slide also provides upward lift of the back section as it is retracted and rotated. This combination of movements mimics the way a person's tissues stretch when they move to a sitting position, reducing pressure and shear. At the same time, the thigh section can be rotated to an incline and the calf section either raised into a horizontal configuration or lowered to a chair configuration during movement of the thigh section. In another embodiment the thigh section is also mounted on a slide to retract towards the foot end as it is rotated to an incline, providing reduction of abdominal strain and increased comfort.