large circle of wood with a ball type stand underneath - you stand on it and it wobbles - strengthens the ankle joint as you try and stop yourself falling off !
Or make one yourself - 30 cm of broom handle and a bit of 7-ply and a couple of nails. Oh, and a strong man to make it for you. Unless you are the strong man!
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maybe also www.innovations.co.uk
large circle of wood with a ball type stand underneath - you stand on it and it wobbles - strengthens the ankle joint as you try and stop yourself falling off !