What Olympic event entails disqualification if both feet of a competitor are seen to be off the ground at the same time?
5000 m walk Run-walking Walking (sport) 3000 metres walk 5000 metres track walk Speedwalking Walk race 100-mile walk 50 kilometre walk 4000 metres track walk Racewalking 10,000 metres race walk Racewalker Walking race 3000 metres race walk 5000 metres race walk 3000 m walk Race walking 5000 metres walk Race walk Run-walk 10,000 metres track walk Race-walking 10km walk Walking-Races 20000 m walk 15 kilometres race walk Race Walking Olympic walking 30000 m walk 10000 m walk 20,000 metres track walk 10,000 metres walk Race walker Racewalk 50000 m walk 50 kilometres walk