Contestants trying to win the £250,000 jackpot included a fitness instructor, a support manager, a boxer, a minibus driver, a Royal Marine, an electrical engineer and a firefighter.
Contestants included a hurling instructor, a lorry driver, a PE teacher, a sports assistant, a single mother and a student. The run ended with three celebrity specials for charity that featured Kelly Holmes and Jenni Falconer; Joe Swash and Kelly Osbourne; and Jennie McAlpine and Ricky Hatton.
Contestants in the new run included a firefighter, a dustman, a PE teacher, a fitness instructor, a skateboarding coach and a penguin-keeper. A celebrity edition for charity featured McFly's Tom Fletcher being encouraged by his bandmates.
Returning for a new run in 2011, the contestants included a childminder, a paramedic, a primary school teacher, a marketing manager, a builder and a martial arts expert. Competing for charity in a one-off edition were 'Coronation Street' stars Ryan Thomas and Julie Hesmondhalgh.
Contestants included a fitness expert, a flight attendant, a builder, a PE teacher, an athlete and a rugby enthusiast. Olympic gold medallists Denise Lewis and Sally Gunnell took part in a contest for charity, and another charity edition featured double Olympic gold medallist Mo Farah.
Returning in March 2013, contestants included a competitive swimmer, a personal trainer, an occupational therapist, a police officer, a legal secretary, an estate agent and a physiotherapist. Olympic gymnast Louis Smith and TOWIE star Mark Wright competed in a charity edition.