It's the ancient Japanese sport associated with throws, pins and limb locks, but judo has brought peace to the Hamilton household of Canberra.
The four Hamilton sisters – Cynthia, 10, Jayde, 12, Alexia, 13, and Chelsey Hamilton, 15 – are saving their energy for their opponents, having all won medals at this month's Victorian Open and taking on the best at the Sydney International Open this weekend.
Coached by former Sydney Olympian and 2002 Commonwealth Games judo gold medallist, Tom Hill, the sisters are quick learners, having only taken up the sport 18 months ago.
"Before judo, there was heaps [of fighting in the house]," said Chelsey "but since we've started judo, there hasn't been much at all. We all get along now.
"I never thought I'd get this far. To be competing at [the] Victorian Open and be placing, I never thought that was going to happen."
The Hamilton family only discovered judo 18 months ago while doing CrossFit together at the Hills Sports Academy in Belconnen.
"I started CrossFit and then I saw judo was here," said Jayde.
"I wanted to make my self-defence a bit better, so if anything happened I could defend myself."
Father, Kelly Hamilton, isn't just proud of his daughters' results in competition, he can also see the confidence each of them have gained. Judo is an Olympic sport.
"I'd like to see them go and represent Australia," Kelly said. "That's what they want to do, but I'd like them to be happy with whatever they do.
"It's just the confidence they get from doing it. I've seen the confidence in Jayde... just from being fitter and more confident and able with her body."
The girls all spoke highly of their coach Hill, saying that he has been able to get the best out of them.
"He is an amazing coach... Just the way he is able to progress people through who have just started. It's amazing what he can do," Chelsey said.
"He has been able to help me win gold at Nationals," said Cynthia. "He is always there for me when I need help."