I would recommend Tai Chi. There are lots of Tai Chi sessions available on You Tube. Just find one you like as they do vary.
I have been doing a Tai Chi class and use a chair to steady me when necessary because my balance is poor. There are also sessions for those who can only sit.
It is a very gentle exercise, but when Michael Mosely measured all sorts of physical indicators when comparing it with a Zumba class it proved to be just as good for you physically and used as much energy.
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