CNN  — 

Four-time Olympic gold medalist Simone Biles says she “should have quit way before Tokyo.”

Arguably the greatest gymnast of all time, the 24-year-old endured mental health battles and the unexpected loss of a family member during the Tokyo Olympics this summer – all while preparing to testify at a Senate hearing regarding the sex abuse investigation of former USA Gymnastics team doctor Larry Nassar.

Arriving in Tokyo widely expected to add to her medal haul, Biles withdrew from the women’s team final citing the ‘twisties’ – a mental block in gymnastics in which competitors lose track of their positioning mid-air – but returned to win bronze on the balance beam.