Regardless...*

Surgery and chemotherapy treatments for her breast cancer had knocked the energy right out of her and all she wanted to do was snuggle under the bedcovers all day.  

Now research bears out what many found by instinct. Exercise helps people battling the fatigue caused by cancer and by its treatment and usually does it better than drugs do.

Karen Mustian of the University of Rochester looked through all the studies they could find on the various ways to help cancer patients get their energy back. Exercise was the clear winner, they reported in the Journal of the American Medical Association's JAMA Oncology.

So exercise regardless.