Fitness advisors Mick Fawcett, from Billingham Forum, and Rachel Paylor, from Splash, Stockton, finished eighth in the National Powerade Fitness Masters Championships, in Birmingham, earlier this month.
They are now challenging other fitness organisations to take part in a contest in aid of BBC Children in Need.
It will include a ten-minute cycle ride during which the competitor will be asked a fitness-related question. If answered incorrectly, the cycle's resistance is increased.
Emma Williams, Stockton Borough Council's health and fitness development officer, said: "It was the first time we put a team into the national championships and everyone was delighted with how well they did.
"We now want to challenge other fitness advisors to raise sponsorship and enter our competition to raise money for Children In Need."
The challenge will take place on Friday, November 7. For details call (01642) 393686.
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