Mostly they land upright with a reassuring thud on the crash mats.
There are dozens of children taking part. Kirkcaldy gymnastics club is noisy and life-affirming. It's a strange place to find a dying man.
Gordon Aikman has motor neurone disease (MND). He was diagnosed at 29. This cruel condition is shutting down his body. There's neither a cure nor an effective treatment.
But Gordon refuses to give in without a fight. He's raising money for research and campaigning for better patient care.
His old gymnastics club is donating Â£700. Gordon competed for and coached at Kirkcaldy.
It's January 2015 - seven months after doctors gave him the devastating diagnosis.
He can still walk with a crutch and he drove himself here from Edinburgh.
But his days as a gymnast are behind him.
"It's difficult" he says. "I've looked back at pictures of me doing handstands and cartwheels and I love exercise and sport.
"And I still dream of being able to run but I can barely walk, so it's a dream I'm not going to realise again."
Throughout 2015, Gordon's physical condition deteriorates.
He has to give up driving. An electric wheelchair replaces his crutch. Carers help him feed, wash and dress.
And there's worse to come.
"The thing that I'm most scared of is losing my voice," he says.
"I think that would be incredibly difficult. So, not only are you paralysed, unable to move, you're then suddenly not able to communicate and speak."
As an insurance policy, Gordon banks speech samples with an Edinburgh university team who are developing a voice synthesizer.
He also secures new rights, for all those who lose their speech, to access voice technology.
As Gordon's body weakens, his campaign - Gordon's Fightback - is going from strength to strength.
It's on course to raise Â£500,000 for MND research.
It has convinced the Scottish government that the NHS, rather than charity, should fund a team of specialist MND nurses and double their number to 12.
Gordon's inspiring example has been widely recognised.
His awards include the British Empire Medal, an honorary doctorate from Edinburgh University and the Public Campaigner of the Year title at the Scottish Politician of the Year Awards.
Yet Gordon is modest about his achievements.
"It's what I could do," he says. "It's what I could give back. It's how I could make a difference".
Gordon Aikman's story is told in a new BBC television documentary. The Fight of Gordon's Life will be broadcast on BBC1 Scotland at 20:30 on Monday.

Cycling's governing body the UCI found the 19-year-old's spare bike contained a motor at January's Cyclo-cross World Championships in Belgium.
Van den Driessche has also been fined 20,000 Swiss francs (£14,000) and been ordered to pay legal costs.
The former European Under-23 champion must also return all her medals.
The result of the World Championship race, the women's under-23 race won by Great Britain's Evie Richards, is not affected.
Scanning of bikes in UCI competitions has been introduced in recent years, but Van den Driessche's was the first found to contain a concealed motor.
There were 274 bikes scanned at the Track Cycling World Championships in London in March.
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UCI regulations, which were recently strengthened, state that a rider is given a minimum suspension of six months and a fine of up to 200,000 Swiss francs (£141,000) for an offence of "technological fraud", while coaches, mechanics and other officials could also be sanctioned.
Van den Driessche was competing during the women's under-23 race at the Cyclo-cross World Championships. The motor was hidden, along with a battery, in the tube below the saddle. It was controlled by a Bluetooth switch installed underneath the handlebar tape.
She has denied suggestions she deliberately cheated, saying the bike was not hers.
"It was my friend's and was identical to mine. This friend went around the course Saturday before dropping off the bike in the truck. A mechanic, thinking it was my bike, cleaned it and prepared it for my race," she told Belgian television in January.
They run, jump and hurl themselves through the air.
[NEXT_CONCEPT]
Belgian rider Femke van den Driessche has been suspended for six years in the first proven case of mechanical doping in cycling.