Mountain bike for an adult. (Moreton CH46)

Hi,
    I hope someone can help me, I have osteo arthritis in most of my joints and prolapsed disks in my spine and need excersise. A few years ago I had a bike and while using it I managed to loose weight. I am hoping that there is someone out there with a bike they no longer need please. I only need a medium size bike as I am only 5ft 9.
Here's hoping.
Thank you
Peter

       
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