Rubuta ci gaba ga wannan sakin layi - Ayyukan baya (kawai) sun cancanci yin rikodin baya kamar yadda aka yi a ƙarƙashin yanayin farawa na yau da kullun; alal misali, Ryan Murphy ya kafa tarihin duniya na mita 100 na baya a lokacin kashi na farko na 4 × 100 m medley relay
a wasannin Olympics na shekara ta 2016.