Do I really need to exercise pre-op? I am just so tired all the time!

I know I should be walking, etc. to get my lungs and heart in shape for my upcoming surgery, but I have zero engergy. By the time I get home from school, I just feel like I want to sleep. I barely even have the energy to study, and my grades are suffering because of this. Should I be worried that I can't seem to make myself exercise before my surgery? How long after surgery will I have to wait until I don't feel like I am a zombie all day? I hope so much that losing maybe 30lbs. will give me the energy I need to get into an exercise routine.

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