A Serenergy Hydrowellnes Bed (SHB) differs from any traditional massage bed, and it is not a massage chair either. Think of it as a single water bed, only better, because the therapy is not performed by a therapist. Instead, the water pressure contained inside runs across the SHB and does the work better. It uses jets of warm & cold, pressurized water to target particular areas of the body better than any other traditional massage could.