My mother used to use these to help with her mobility after she was unable to walk. Kept her knees and ankles moving and a bit of cardio. Just put them on the floor in front of the chair and pedal.
I had taken off the rubbers that were on the feet and replaced them with bicycle inner tubes, as this made it less slippy on a wood floor
mobility, exercise chair pedals. (Southgate N14)
This offer has been gifted to someone and is no longer available.