Simone Biles has become the most decorated gymnast of all-time
She won her 24th and 25th medals at the World Gymnastics Championships in Stuttgart, Germany
Biles took a break from the sport and didn't think she would compete again
She revealed in an interview that she struggled with mental health issues
Biles has won 19 gold medals, 3 silver medals, and 3 bronze medals in her career
She is considered one of the greatest gymnasts of all-time
Biles is expected to compete in the 2020 Olympics in Tokyo