Conveniently buses tend to stop at multiple places - not just your home and your office.
So, assuming your interest is in walking more (but not necessarily 16 miles a day) you could perhaps walk a little way, and catch the bus from a different stop. And/or perhaps get off the bus a few stops before your office and walk the last bit. You can adjust to taste depending on how you're feeling, how late / early you're running, whether it's raining, and so on.
