Brenna Hope Brooks was born on January 19, 2001 in Dallas, Texas to Baine and Juli Brooks. She has an older sister, Brittani who plays tennis. Brenna is a junior at Spring Creek Academy and she will graduate from high school in 2019. During Brenna's spare time, she enjoys drawing, playing piano and shopping.

Brenna's older sister did gymnastics and Brenna was always running around the gym during her lessons. The coaches kept asking her mom when Brenna was allowed to take pre-team classes! Brenna joined pre-team at four years old at Eagles Wings Athletics. She trained under coaches Virginia Oas and Alex Canton between 2007-2010.

Brenna competed level 6 in 2009. She won the all-around title at the District Championships and North Texas State Championships. At the State Championships, she placed first on vault, uneven bars and in the all-around with a 38.000. Brenna immediately moved up to level 7 for the 2010 season where she placed second in the all-around with a 37.950 and first on uneven bars, balance beam and floor exercise. After the 2010 season, Brenna moved to World Olympic Gymnastics Academy (WOGA) in Plano, TX.

As a level 8 gymnast in 2011, Brenna finished third on uneven bars with a 9.825 and 12th in the all-around with a 38.025 at the State Championships. She qualified to the Region 3 Championships where she finished ninth in the all-around with a 38.175 and second on uneven bars. Brenna moved up to level 9 for the 2012 season where she had a solid meet at the State Championships, finishing fourth in the all-around and second on uneven bars. At the Region 3 Championships, she finished fourth in the all-around with a 38.150, first on uneven bars and second on balance beam. She qualified to the Level 9 Western Nationals where she placed 17th in the all-around and sixth on uneven bars.

Brenna moved up to level 10 for the 2013 season. She placed fifth on uneven bars at the State Championships. In 2014, Brenna placed 18th in the all-around with a 36.200 and top 15 on vault, uneven bars and balance beam at the Region 3 Championships. In 2015, Brenna had a great meet at the State Championships, finishing second in the all-around with a 38.575, second on balance beam and floor exercise and third on uneven bars. At the Region 3 Championships, she finished second in the all-around with a 38.750, first on vault, second on uneven bars and balance beam and fourth on floor exercise. She qualified to the Junior Olympic Nationals in Des Moines, IA where she placed fifth in the all-around with a 38.050 and fourth on vault. Brenna was unable to compete in 2016 due to an injury.

In 2017, Brenna earned gold medals on balance beam, floor exercise and in the all-around at the State Championships. At the Region 3 Championships, she placed third in the all-around with a 38.125, second on vault and balance beam and third on uneven bars and floor exercise. Brenna qualified to the Junior Olympic Nationals in Indianapolis, IN where she placed third on vault.

Currently, Brenna is preparing for the 2018 season. She trains 36 hours per week at World Olympic Gymnastics Academy (WOGA) under coaches Natalilya Marakova, Megan Haught and Egor Grebenkova. Brenna verbally committed to the University of Washington for the 2019-2020 school year.