The four-year-old daughter of Olympic rowing champion James Cracknell and TV presenter Beverley Turner was among dozens of people who joined in a rowing fund-raising event in Henley market place.
She climbed on an ergo machine and completed about 10 strokes.
Trixie and her six-year-old sister Kiki were spending a week with their grandparents in Makins Road.
Cracknell said: “Beverley’s parents Joyce and Roger have just moved to Henley from Manchester so the girls were with them.
“Trixie is a very outgoing and happy person. She will try just about anything. She’s quite competitive and stubborn as well — maybe it’s in the blood.”
The event on Friday was to raise money for the Regatta for the Disabled, which takes place at Phyllis Court Club tomorrow (Saturday). Members of the public were invited to try to row the fastest 2km on an ergo in return for a donation. There were prizes for the winning man, woman and child.
The first race of the day involved Mayor Lorraine Hillier and former GB rower Toby Garbett, a fitness instructor who lives in Henley.
They were joined by Ian Tritton, chairman of the regatta, and Howard Feather, manager of the NatWest branch in Market Place, who organised the event. Councillor Hillier, who had never rowed before, completed the row in 11 minutes and 30 seconds, while Mr Garbett finished in five minutes, 56 seconds, which was the fastest time overall.
After her race, Cllr Hillier said: “It was an absolute killer. Now I have full appreciation for rowers because I never realised how hard it is.
“They make it look effortless on the water. I thought it was only the upper body you use but it’s the legs as well.”
Mr Tritton took seven minutes and four seconds and Mr Feather took six minutes 58 seconds.
Mr Tritton said: “I found the row okay. I have not rowed competitively for a long time or had any practice.
“It’s fantastic that NatWest are doing this. We rely on fund-raising events such as this.”
About 50 people took part across the day. The winner of the junior section will receive a tub of jelly beans and the winners of the men’s and women’s sections will get a bottle of wine each.
The event raised £1,200. Mr Feather said: “Henley has a great connection with rowing so we thought it would be a great event for a great cause.
“I’m really chuffed with the amount we raised. It’s amazing to have such support.”
Olly Barkley, a former England rugby international, came along to support the event along with Nick Roullier, who led the campaign to save the LA Fitness gym in Henley.
There was also a raffle to win one of the four rowing machines, which were supplied by WaterRower.