Men's racewalk. Walker at right appears to be illegal in that both feet are off the ground, but an infraction is only committed when loss of contact is visible to the human eye.[1]
The 50-mile race walk is a racewalking event. The event is competed as a road race. See Kennedy march for the 50-mile walk started a fitness challenge.
Athletes must always keep in contact with the ground and the supporting leg must remain straight until the raised leg passes it. 50 miles is 80.47 kilometers.[2][3][4][5]