Body support and method for supporting a body

A therapeutic body support for providing body pressure that spatially varies with a spatial repeat comprising:

• a frame;
• a first plurality of flexible parallel bands each having an attached end attached to said frame;
• a second plurality of flexible parallel bands, said first plurality of bands being interleaved with said second plurality of parallel bands;
• a single primary shaft rotatably mounted in said frame and mechanically linked to said first plurality of bands away from said attached ends for mechanically engaging all of said first plurality of bands and not any of said second plurality of bands and for providing from the first plurality of bands a spatially varying pressure that varies with a spatial repeat;
• and
• a driver coupled to said single shaft to rotate it in order to induce alternate tightening and slackening of all of said first plurality of bands in unison and with a period appropriate for preventing a debilitating condition such as bedsores.