Medal-winning Olympian Kristian Thomas had children at Sacks Morasha rolling and jumping as he led a special PE session at the North Finchley school.
They had to complete a circuit of four exercises consisting of spotty dogs, press-ups, mountain climbers and star jumps — and also learned how to do forward rolls and backflips.
Mr Thomas, who won a bronze with the British gymnastics team at the 2012 London Olympics and is a former European champion, helped those who found the challenge daunting to see that anyone could have a go,
The sponsored event raised money towards improving physical activities at the school and supporting British athletes.
