Walking, jogging or running but not in a vehicle or on the back of an animal(adverb)
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Use "by foot" in a sentence
"She doubted there had been an attack by foot soldiers; they were probably cavalrymen who had lost their mounts."
"This was Vuliva! this was her foreign home! the region where darkness and light were struggling foot by foot for the mastery; where heathen temples were falling and heathen misery giving place to the joy of the gospel, but where the gospel had to fight them yet."
"But as it turned out, traveling by foot was much slower than flying, and they did not reach the Golem house that day."