Ancient cultures were known to make use of natural hot springs, from the Japanese “onsen” since at least A.D. 737 to the Roman thermal springs and bathhouses. When hot springs were not available, past cultures created rudimentary hot tubs by adding heated stones to a cauldron of water. Later on, the Romans developed piping to carry hot water from a furnace to a pool or other contained body of water. While these facts mark the beginnings of the importance of hydrotherapy, it was the Jacuzzi brothers that pioneered what became known as hydromassage.