Nowadays many of us have access to a whirlpool bath or hot tub..maybe at the gym or YMCA, swim club, or even at home. Using water in this way, for therapeutic purposes has existed for many years. While it may not be a long term solution to the problem of chronic pain, the combination of warm water and massaging effect of body jets can feel very soothing to achy joints. There is a mental effect as well; enjoying the sensation can give a brief respite to mental tensions and anxieties, even if only for a few moments! Muscles relax ; circulation is increased and the body's immune system can be strengthened by way of hydrotherapy. The heat of the water can induce sweating, which can help to detoxify our bodies of unwanted impurities.
What's not to like? :)