Cika wannan jumla: Ayyukan baya (kawai) sun cancanci yin rikodin baya kamar yadda aka yi su a ƙarƙashin yanayin farawa na yau da kullun; misali, Ryan Murphy ya kafa tarihin duniya na mita 100 na baya a lokacin farkon ɓangaren gasar
4 × 100 m medley relay a wasannin Olympics na lokacin rani na 2016.