BBC Breakfast’s Rachel Burden has revealed she has broken her ankle after confusing fans by wearing trainers on-air.The presenter, 46, who also hosts BBC Radio 5 Live, was spotted wearing the casual footwear on the show last week by eagle-eyed viewers.Taking to social media to explain her unusual choice of trainers, Rachel joked that she had "ditched her grown up shoes" and had "scrubbed" her daughter’s Nike Air Force shoes after injuring her ankle while playing football in June.