Increasing your activity level is the true goal of this team. Every individual is working from the same goal - to do a little more than they did before. It is always best when we understand where we are starting from, and then be just a little bit better.
With your circumstances, I would suggest that you talk with your physician or have your physician recommend a trainer or someone else who could help you set some goals for your fitness. That way you can make sure you are not doing to much at once. You can improve your fitness without risking injury.
Good luck. We're all doing baby steps together.
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