JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
Hydrotherapy. Man exercises with weights in a hydrotherapy pool, supervised by a physiotherapist. Hydrotherapy involves exercising in water to build up strength and improve joint mobility. The supporting effect of the water makes the exercise easier and gentler for those recover- ing from injury, surgery, or suffering from a lack of mobility such as victims of arthritis.
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