Simone Biles opens up about the twisties: "My mind and body are simply not in sync."

Simone Biles is setting the record straight, taking to her Instagram Friday morning to explain the circumstances that led to her withdrawal from three events in Tuesday's women's team final and all of Thursday's women's all-around final.

"For anyone saying I quit. I didn't quit," she wrote on an Instagram story slide. "My mind and body are simply not in sync."

A subsequent video showed the 24-year-old attempting another uneven bars dismount on to soft mats in a foam pit and bailing out a half turn shy of her intended element. The video was later deleted.

"I don't think you realise how dangerous this is on a hard/competitive surface," she wrote. "Nor do I have to explain why I put my health first. Physical health is mental health."

Biles, then, explained that she was not dealing with these issues prior to leaving for the Tokyo Olympics. But her problems started the after qualifying round.

"It randomly started happening after prelims competition, the VERY next morning," she said.

In a Q&A that follows the training videos, which Biles confirmed were taken Friday morning, she calls the phenomenon the "strangest & weirdest thing, as well as feeling."

"I have experienced them before. They're not fun to deal with," she said of the 'twisties,' which is said were bothering her Tuesday, in a further post. "It's honestly petrifying trying to do a skill... not having your mind and body in sync."

Artistic gymnastics competition resumes Sunday (1 August) with the first of three days of apparatus finals. Biles has qualified to all four events but isn't able to say how long the twisties might affect her.

"Honestly, no telling," she said when asked 'how long does it usually take for it to leave.' "Time frame [is] something you have to take literally day-by-day, turn-by-turn."