To SP. This is a great site - not only lots of resources, but there are lots of great people ready to support you!
I understand what you say about not exercising due to medical conditions - I stopped exercising for a good part of last year due to sore knees and gained back most of what I had lost. But the good news is it's never to late to start over and I congratulate you on making the decision to do what you have to do to lose that weight! Remember,
You might want to think about designing your Spark Page and making it public so that people can visit you and get to know you. I've discovered that my Spark friends are my biggest motivators!
Joining a few teams and posting on the message boards is a great way to meet people and make friends!.
I wish you success on your journey!