I walk all the time, too. Monty (dog) requires it to keep his little innards working. (IBS in a dog - sheesh!)

I'm also walking home from work semi-regularly. On those mornings that I'm too lazy, or the weather is too yucky, or it's just more friendly to ride with DH to work, I car it, then walk the 2 miles home. Co-workers don't think such a thing is possible. What do they know?