Height
5'3"
Weight
135
Profession
Athlete
Accolades
- In 2022, O'Brien became the youngest person to win the CrossFit Open.
- At the 2022 CrossFit Games, O'Brien finished in second place after six-time winner Tia-Clair Toomey,
- 2022 CrossFit Open Winner
- The youngest person ever to podium at the CrossFit Games.
- Rookie of the Year CrossFit Games 2021
- 2019 Teen CrossFit Games 5th place finish
- 2018 Teen CrossFit Games 4th place finish