http://harradineperformance.com/wp-content/uploads/2015/09/High-Resolution-Final-Logo-300x300.png00Benn Harradinehttp://harradineperformance.com/wp-content/uploads/2015/09/High-Resolution-Final-Logo-300x300.pngBenn Harradine2020-07-07 15:56:002020-07-07 16:22:12Understanding the discus circle