shank's pony
One's legs and feet, used for walking; travel by foot. Also "shanks' pony." A reference to the shank—the lower leg between the knee and the ankle—and the use of ponies or horses for travel. My bicycle fell apart three miles away from home, so I had to use shank's pony to go the rest of the way. Unfortunately, with the sedentary lifestyle many lead today, shank's pony has largely become an obsolete mode of travel.