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Doyle was a member of the British Parachute Regiment and was discharged in 1986. Doyle has 49 entries and re-entries in the 1990–2008 Guinness Book of World Records.
- World Fitness Endurance Champion, 2009
- 1,500,230 press-ups in one year
- 716 step ups in an hour, 2006
- World's fittest man, 2004