Imagine creating a swimsuit so good it would have to be banned.

That's what Jason Rance and his team at Speedo did ahead of the Beijing Olympic Games in August 2008. Wearing the LZR Racer swimsuit, United States swimmer Michael Phelps won a record eight gold medals at the Water Cube. Athletes wearing the swimsuit would shatter 30 world records in the space of three months.

The reduction in skin friction drag was so significant, some called it "technological doping". The suit developed with space agency Nasa had no seams, featured a special water-repellent fabric and had a design covering the legs which lifted the swimmer's hips in the water. It caused a furore with athletes ditching sponsorship agreements with rival firms to get hold of it. A slew of copycats came on the market before the design was banned from future competitions. Jason Rance who was the head of Speedo's research and development Aqualab, reveals to Josephine McDermott the behind-the-scenes development which would turn competitive swimming on its head.

Eye-witness accounts brought to life by archive and testimony. Sporting Witness is for those fascinated by sporting history. We take you to the events that have shaped the sports world through the eyes of the people who were there. For nine minutes, you become a fan in the stands as we take you back in time to examine memorable victories and agonising defeats from all over the world. You’ll hear from people who have achieved sporting immortality, or those who were there as incredible sporting moments unfolded.

Recent episodes explore the forgotten football Women’s World Cup, the plasterer who fought a boxing legend, international football’s biggest ever beating and the man who swam the Amazon river. We look at the lives of some of the most famous F1 drivers, tennis players and athletes as well as people who’ve had ground-breaking impact in their chosen sporting field, including: the most decorated Paralympian, the woman who was the number 1 squash player in the world for nine years, and the first figure skater to wear a hijab. You can learn all about fascinating and surprising stories, such as the tennis player who escaped the Nazis, how a man finally beat a horse in a race, and how the FIFA computer game was created.

(Photo: Swimmer Michael Phelps in the Speedo LZR Racer. Credit: Tom Shaw/Getty Images)