BMX world champion Mariana Pajon to test London track
The 19-year-old who hails from Medellin, Colombia's second-largest city, has already won 14 global titles.
Great Britain's three-time world champion Shanaze Reade is one of her idols.
Read more: Reade set for key BMX test event
You can watch a special Olympic Countdown programme on BBC Two on Sunday at 1300 BST.