Glynn's first race was the Coventry Primary Schools Cross Country Championships in 1979; and his last was the World Cross Country Championships of 2005.
Glynn won seventeen UK and National titles on all surfaces including the AAA 10,000m title, three National Cross Country titles, five CAU/World Trial cross country titles and three British Half Marathon Championships.
He also represented his country at seventeen Major events including nine consecutive World Cross Country Championships between 1997 and 2005.
His full international debut came in 1997 just after his 28th birthday, and nine months after his second heart operation to clear a defective electrical pathway in his heart.
In 2005 at the age of 36, Glynn completed a double double by winning both the National Cross Country and the CAU/World Cross Country Trial in the same year, repeated the same feat from the 2004.
Glynn is now coaching endurance athletes at Coventry Godiva Harriers, a club he first joined as a twelve year old.