NEED ADVICE: CAN'T SEEM TO PROGRESS MY WALKING DISTANCE OVER 1 MILE

My doc requires that I be walking 2 miles (once a day) or he won't do surgery. I'm up to a mile, but I'm absolutely pooped after that and my feet and shins go numb. I've been walking on flat ground or a motorized treadmill. Anyone have and advice for me?

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