No. You can use Celluma while sitting or lying down. For example, there are two ways to use Celluma when targeting the lower-back region: sitting comfortably in a chair with Celluma curved horizontally around the lower back area, or lying down with the device placed on the lower-back region. The Celluma may also be placed vertically on the spine following the natural curvature of the body. The key benefit of its design is the unique ability to mold its shape to conform to the profile of the body. Do not lie directly on top, lean against or apply full body weight to the device.