Reddin's rugby experience began in 1996 as a fitness coach with Leicester.

He worked for England's Rugby Football Union (RFU) as a fitness expert between 1997 and 2006, with the pinnacle being the World Cup success in Australia in 2003

He was also part of Sir Clive Woodward's backroom team on the British and Irish Lions' tour of New Zealand in 2005.

Reddin held the role of director of performance services for Team GB at the London 2012 Olympics.

After his spell working with Team GB, Reddin joined the FA in 2014 as head of performance services under then director of elite development Dan Ashworth.

Reddin's role initially focused on England's development teams but he was appointed head of team strategy and performance in 2016.

That role included responsibilities for performance medicine, analysis, physical performance, nutrition and people development.

Reddin worked with Gareth Southgate's senior England side, including at the 2018 World Cup when they reached the semi-final.

FA chief executive Martin Glenn said Reddin had played a "key role across all 28 of our England teams" when he left the organisation in 2019.

In 2020, Reddin co-founded Pitch32, an agency which works with investors in football to transform on and off field performance.

In club football, he was part of a management team who led the acquisition and transformation of third tier Spanish football club, CD Castellon, helping creating the circumstances for their promotion to the second tier.

Most recently, Reddin has been working with UK Sport and assisting on developing strategies for the future of the UK Olympic sport system.