Wiktionary
by walking
adv. walking, jogging or running but not in a vehicle or on the back of an animal
Usage examples of "by walking".
I experienced a restlessness which could only be satisfied by walking the streets.
He trains Last Hope by walking him and galloping him along the country roads in person, and taking care of him as if he is a baby, and what with this work, and the jog up from Miami, Last Hope fills out very strong and hearty, and anybody must admit that he is not a bad-looking beetle, though maybe a little more leggy than some like to see.