Many athletes who have been through the injuries and hard luck that Sarah Walker has during the last six years would have given the sport up years ago. But Walker is not wired that way.
She has had a tough run since winning silver at the London Olympics in 2012, but in 2018 she started looking like her old self again, winning her third Oceania BMX title, the elite women's race at the New Zealand BMX Championships and standing on the podium at a World Cup event for the first time since.
At 30 years of age she still believes she can return to the top of the sport and has her sights firmly set on the Tokyo 2020 Olympics.
"Just like every other year, 2018 had its ups and downs, but the highlight was definitely making the podium at the last World Cup in Argentina at the end of September. That was massive, 2015 was my last podium at elite level, that was the World Champs in Belgium. At World Cup level, my last podium was 2011," Walker says.
"Obviously, in 2012 I won the Olympic medal, but three months before that I dislocated my shoulder and that sparked the beginning of a lot of injuries and set backs. I maintained this self-belief that I could still do it right through, which was awesome but really hard, it can be really challenging, especially when there are so many set backs.