David began training in 1998 under Sensei Mulholland in the old Meidokan dojo in West Hampstead London.

"Training to me is a totally positive and life-affirming experience, learning skills and attitudes applicable and beneficial to all aspects of life. Since training in Goju-Ryu under Sensei Mulholland I have discovered greater emotional depth and strength of mind, achieved through physically and mentally challenging training. With so much to learn there are constant possibilities for goals to achieve and boundaries to push. I enjoy embracing what is difficult and conquering it, breaking self-imposed limits, creating increased confidence and self-belief."

David was awarded the rank of Shodan in 2004 and completed his 30 Man Kumite and Nidan grading successfully in 2007. In 2013 he achieved the rank of Sandan (3rd Dan) at the annual DKK summer camp and progressed to the weapons test grade of Yondan (4th dan) in 2017.