Born in Santiago, Hernández graduated as a psychologist from the University of Chile in 2012, and in 2017, she earned a master's degree in psychology from the same institution.[4]
At the age of 17, she began her journey in open water swimming, inspired by Chilean swimmer Víctor Contreras, Americans swimmers Lynne Cox and Jaimie Monahan, and Mexican swimmer Nora Toledano.[5]
In 2014, she received an invitation to participate in that year's Winter Swimming Festival,[6] where she swam in −5 °C waters at the Perito Moreno Glacier in Argentina without a wetsuit or any insulating grease to protect against the cold.[5]
Hernández topped the global Ice Swimming ranking according to the International Winter Swimming Association (IWSA)[7] during the 2017-2018 [8] and 2018-2019 seasons. She was also awarded world championship titles by IWSA in Tyumen 2016, Bled 2020 and Tallinn 2024.[9] In addition, she has been recognized by the International Ice Swimming Association (IISA), earning championship titles in Murmansk 2018, Samoëns 2023, and Molveno 2025.[10]
In 2024, Hernández crossed the Tsugaru Strait in Japan, becoming the first South American to complete the Oceans Seven challenge.[11]
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