Dalilah Muhammad (USA) poses in the starting blocks, Wednesday, Jan. 15, 2020, in Lake Balboa, Calif. Muhammad, the 2016 Rio Olympics and 2019 IAAF World Championships gold medalist in the women's 400m hurdles, is the world record holder at 52.16 seconds. Muhammad is only the second female 400 meter hurdler in history, after Sally Gunnell, to have won the Olympic and World titles and broken the world record.
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