[2][3][4] Briggs lived and trained in Miami, USA for the 2015 CrossFit season, but now resides in her native England.

Before she found CrossFit in 2009, she competed in amateur-level duathlons, triathlons,[5] and football in the Northern Premiership League (as a centre midfielder or centre-back).

[9] At the 2010 CrossFit Games, Briggs' highest finish was third place on "Pyramid Double Helen",[10] which she completed in 18:30.

The only two women to beat her were the overall second and first place Games finishers, Annie Thorisdottir (17:53) and Kristan Clever (18:23).

"[11] With awareness of her injuries, her coach, Steadman, and sports therapist, James Jowsey, were able to program workouts that would not cause further damage.

[2] Briggs had three event wins, and won decisively overall, with a 79 points lead over second-place finisher Lindsey Valenzuela.

[13] The next spring, Briggs won the Open yet again but failed to qualify for the Games after placing fourth at the 2014 Europe Regional.

[15] Midway through the CrossFit Open qualifying stage, she injured her Sacroiliac joint, and prior to the Regionals she broke her foot.

Despite the injury, Briggs still managed to earn 2nd overall at the 2015 Atlantic Regional,[16] qualifying for the 2015 CrossFit Games.

[20] At the 2017 CrossFit Games, Briggs started strongly and tied first place with eventual winner Tia-Clair Toomey after the first day.