Susannah Constantine, Les Dennis, Tameka Empson and Miles Jupp push themselves to the limit as they embark on a mission to regain their fitness and help inspire the great British public to get active and do their part for Sport Relief too.

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Helping them on their way will be former Olympian, world renowned sports scientist and physical activity expert Professor Greg Whyte OBE and Dr Zoe Williams, presenter of BBC Two’s Trust Me, I’m A Doctor.