Combining shopping trips/errands and extra walking seems to work well for me. Today I had a couple of things to pick up at a so-called Smart Center, with a WalMart at one end, huge parking lot, other stores, more parking lots, etc. Center is maybe 4 city blocks long. I parked at the back of the Walmart (where I was NOT shopping), and walked back and forth to the stores I actually needed to get to. It takes more time to do it this way, but I'm retired, so why not?
Now I'm home and rearranging furniture and doing a deep clean in the basement. I'm sweaty, so figure I'm getting effective exercise. : D