Support apparatus for equipment for lying or sitting on

A support apparatus (1) for lying or sitting equipment, comprising an at least partially fixed frame (2) and comprising intertwined tensioned straps (4) which define a support surface (8) and are accessible from the upper support side of the support surface, wherein at least some of the straps (4) are connected to the frame (2) by means of separately adjustable tensioning devices (7) such that the pretensioning of the straps (4) is locally adjustable, wherein the tensioning devices (7) are arranged between the straps (4) and the frame (2) and that the straps (4) are also accessible from the underside of the support surface (8) such that the support surface (8) is accessible from the underside, that the tensioning devices (7) comprise a drive (26) for adjusting the pretensioning, and that the drives (27) of the tensioning devices (7) are controlled and/or controllable separately such that therewith the hardness of the support surface (8) is locally adaptable at any time, wherein a locally adjustable pretensioning of the straps (4) is adjustable in accordance with a pretensioning profile, e.g. automatically.