It was break No 16 that did it.
After enduring a wretched run of injuries over the past four years, her 16th broken bone in her career proved to be one hurdle too many for BMX star Sarah Walker.
The London silver medalist's hopes of competing in her third straight Olympics were destroyed by a crash during the warm-up rounds at the world championships in Colombia last month.
Despite breaking a bone in her shoulder in the crash, Walker still competed in the event, but was unable to advance beyond the first round, ending her chances of qualifying for Rio.
In this week's episode, Walker opens up about the heartbreak of having injury end her Olympic dream, and her determination to compete again.
