Legs pains while exercising (PRE OP)

I have been trying to get my heart and lungs in better shape prior to surgery. I have been walking between 1.5-2.0 miles per day on various terrain (track, grass, road way). Now when I walk the outside of my left calf (just about ankle) burns and aches until I stop walking. Anyone know what this is? Is it the typical fat and out of shape answer, or something more? I don't want to quit walking, can anyone help?

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