Australian swimmer Shayna Jack was driven by anger, pain and injustice.
Now vying for her third Commonwealth Games appearance, the Paris Olympic gold medallist has found new motivation: swimming in Glasgow with younger brother Jamie.
Australia's 42-strong squad for this year's Games will be decided from Monday in the week-long trials at Sydney Olympic Park, with selection for the Pan Pacific championships also on the table.
Freestyle swimmer Jack will be just one of many heavyweights in the Sydney pool, joined by Mollie O'Callaghan, Kaylee McKeown, and an in-form Lani Pallister.
Pallister has set herself an audacious program, racing in the 100, 200, 400, 800 and 1500 freestyle events.
Cameron McEvoy - 50-metre freestyle world record holder - headlines the men's field, alongside Kyle Chalmers and Zac Stubblety-Cook.
Jack will compete in the 50-metre and 100-metre freestyle sprints - the same program as 23-year-old brother Jamie.
Should both Jack siblings make the Glasgow team, they will be the first sister-brother duo to represent Australia since Emma and David McKeon swam at the 2018 Gold Coast Games.
"I have done a lot in the sport - I've done the world records, the gold medals, the time away from the sport," Shayna Jack told AAP.
"I really just wanted to come into this and support my brother and try and help him as much as I could.
"It's an extra edge for him potentially, and it's an edge for me.
"That's what I was really looking for after Paris, something that motivated me to get back in the pool."
Jack was part of the gold medal-winning 4x100m freestyle and 4x200m freestyle relay teams at the Paris Olympics after serving a two-year doping ban.
The Brisbane product had failed an out-of-competition drug test in 2019 and missed out on the Tokyo Olympics.
After an investigation, the Court of Arbitration for Sport found an accident had led Jack to ingest a banned substance.
The 27-year-old says the saga remains "a trauma I haven't dealt with".
"It is hard to tame the beast of competitiveness, but I really didn't like the kind of athlete that I had become in a way," Jack said.
"I became someone that was driven by the anger, that drove me into Paris, and that injustice that was done to me, I used that as fuel.
"As much as that did get me the results that I had hoped for, I just didn't want to potentially continue my career that way.
"I haven't looked at whether or not I have another level or not. I've just looked at the fact that I'm really proud of the kind of person that I've become.
"Because of everything that I've experienced in my swimming career, I wouldn't be who I am without those experiences.
"It's still something that comes up quite frequently for me, and it's still a trauma I haven't dealt with, but I will get there."
