I haven’t found any official rules of the Olympic games, not even on the official Olympic's website. Other sources are also unclear but at least nothing mentions about the requirement of alternating both feet in a race.
According to the record of International Association of Athletics Federation:
100 Meters
Human record:
Male - 9.74s, +1.7 wind, Asfa Powell, Jamaican, September 9th, 2007.
Female -10.49s, 0.0, Florence Griffith Joyner, United States, July 16, 1988.
Kangaroo record: can speed up to 44 mph or 71kph in case of an emergency although only for a few hundred yards, perfect for sprints = 5.084s
Long Jump
Human record:
Male - 8.95 meters or 29-4½ feet, Mike Powell, USA, Tokyo on Aug 30, 1991
Female - 7.52 meters, Galina Chistyakova, URS, Leningrad, June, 11, 1988
Kangaroo record: 12.8 meters or 42 feet.
High Jump
Human record:
Male - 2.45 meters/8 feet, Javier Sotomayor, Cuban, July 23, 1993
Female - 2.09 meters/6.85 feet, Stefka Kostadinova, Bulgarian, August 30, 1987
Kangaroo record: 3.10 meters or 10.17 feet
Hurdling:
In sprint hurdle races for men or 110m, regardless of the length of the race, the first hurdle is 13.72 m from the starting line and the distance between hurdles is 9.14 m.
In sprint hurdle races for women or 100m, the first hurdle is 13 m from the starting line and the distance between hurdles is 8.5m.
Hurdle height is 42 inches (1.07m) for men and 33 inches (.84 m) for women.
Male - 12.88s, Liu Xiang, China, 2004
Female - 12.21s, Yordanka Donkova, BUL, Stara Zagora, Aug, 20, 1988
In long hurdle events or 400m, whether for men or women, the first hurdle is 45 m from the starting line and the distance between hurdles is 35 m.
Hurdle height is 36 inches (.914 m) and 30 inches (.762 m) for women.
Male - 46.78s, Kevin Young, USA, Barcelona, Aug 06, 1992
Female - 52.34s, Yuliya Pechenkina, RUS, Tula, Aug 08, 2003>
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