"It's not the same," the 24-year-old said, fighting back tears. "To do something that I've done forever, and just not be able to do it because of everything I've gone through is really crazy because I love this sport so much. It's hard. I'm sorry."
She added, "I'm still scared to do gymnastics."
Biles has been performing in the Gold Over America Tour the past few weeks ... though she said she's kept her routines simple and has avoided any twisting.