David 'Jacko' Jackson is an Ultra marathon World Record holder, author of 'Breathe Smarter, Run Stronger', coach and consultant working with elite and professional athletes to improve all aspects of their physiology, both physically and mentally, through the power of their breath. Jacko ran 100 ultra marathons in 100 days for 2 brain injury charities (Headway UK & Head for Change) in 2026 having sustained his own traumatic brain injury back in 2013, where a seizure on the pitch and a bleed on the brain ended his professional rugby career. Breath training became an essential part of his recovery and now it's at the heart of his coaching and consultancy work.
