Walking After Surgery?

I was just thinking why is it so important to start walking soon after surgery, for example, a burst appendix? I've heard that doctors and nurses stress walking after surgery. Isn't the patient still in a lot of pain and they probably feel weak. Shouldn't they rest or does the walking do something... show more I was just thinking why is it so important to start walking soon after surgery, for example, a burst appendix? I've heard that doctors and nurses stress walking after surgery. Isn't the patient still in a lot of pain and they probably feel weak. Shouldn't they rest or does the walking do something special to help the body recover after surgery? I am just curious as to why that is stressed since reading an old book when one of the characters had his appendix out and he was in the hospital for a longer time and the walking was not stressed, mainly rest. And no the character was not old either...the book was set in the early 1900s I think. Thanks in advance.
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