I'm so sorry that you have been diagnosed with BC. There are way too many of us! Being reasonably fit will help you recover from your surgery much faster. This time of waiting for surgery and pathology results is so hard.
I found it helped me to keep exercising right up to my surgery and as soon as I could again afterwards. It just helped me to feel like I was doing something to help myself rather than just sitting there letting my mind run away with all sorts of scarey thoughts.
All the best for your surgery. I hope that it goes as well as possible. Take care. Deanne xxx