David McKenzie – Founder of Sub3fitness
David McKenzie grew up in South London in a family where competition and discipline were second nature. His brother was a southern area boxing champion, and David himself went on to to make his mark as a 400m relay sprinter.
As part of the British team with Brian Whittle, Roger Black and Du’aine Ladejo, David became European Champion in 1994, running a world-leading time under three minutes – a milestone that inspired the creation of Sub3fitness. The name represents not just breaking barriers in sport, but in life: accomplishment, hard-work, determination, inspiration and desire.
Guided by legendary athletics coaches Joyce and Jim Faichnie, and Earl Eustace Herbert, David experienced first hand how great coaching transforms potential into performance. That belief now drives his work with Sub3fitness clients today.
With a level 4 personal training qualification and over 20 years experience in healthcare and rehabilitation, David has worked across cancer care, sports performance and functional strength. He also works at St Christopher’s Hospice alongside physiotherapists, and occupational therapists helping people regain strength, improve mobility and achieve their personal goals.
At Sub3fitness, David combines elite sporting experience with clinical expertise to deliver coaching that goes beyond fitness – helping you get stronger, stay accountable and transform your life.