MODEL RELEASED. Hydrotherapy. Men in a hydrotherapy pool at a rheumatism clinic. Douching with high pressure water jets (centre left and right) is being carried out by physiotherapists. Rheumatism is a group of conditions that are characterised by painful joints and muscles. The heated water supports the body's weight, soothes joints and improves blood circulation. Douching invigorates the skin, in a similar way to massage, improving skin tone and blood circulation.