Planar spa

Quick answer：

Planar spa refers to a spa or wellness center designed with a focus on treatments that are carried out on flat surfaces, as opposed to traditional hot tubs or whirlpools. These facilities may offer services like massage therapy, facials, and body treatments that are performed in a more open and spacious area. The term 'planar' here indicates a layout that is primarily flat and does not involve elevated or rounded structures.