Unque, fun chair exercises or other exercises for seniors with limited mobility

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I am trying to come up with some unique, fun chair exercises or other exercise classes for seniors in an assisted/independent living facility who may have limited mobility or can walk.  I know that if I chose walking as an exercise, some may not be able to participate?  But, anything different as far as fun chair exercise classes or another exercise class that would be fun for seniors, and not something that is usual as chair yoga is.