17:06BBC OS2021/07/30 16:06 GMT: Simone Biles still struggling with 'twisties'BBC World Service Duration: 50 minutes Fri 30th Jul 2021, 17:06 on BBC World Service OnlineSimone Biles explained her problems during a social media Q&A session Show more GenresNewsFormatsDiscussion & TalkBrandBBC OS Source: BBC Online