Omer Danenberg-Lerner was born on July 4, 2003 in Israel to Hagai and Vered Danenberg Lerner. She currently lives in Florida with her parents, an older sister, Yuval, a younger sister, Shachar and a labradoodle named Shadow. Omer is a student at Florida Virtual School and she will graduate from high school in 2021.

Omer broke her elbow when she was five years old. One day, her mom took Omer to a gym and she saw the girls practicing there, it was then that her mom made a promise to Omer that she will start as soon as they take the cast off. Omer started her gymnastics career at Elite Champion Gymnastics (ECG) in Plano, TX. When she was at ECG, she won the all-around title with a 39.075 and first on vault, uneven bars and floor exercise at the 2011 North Texas State Championships. Omer was named in America's Top 100 for vault (twice), uneven bars (twice), balance beam and in the all-around (4 times) in level 4. Elite Champion Gymnastics closed down in the summer of 2012, so Omer started training at Texas Dreams Gymnastics in Coppell, TX.

At the 2012 Level 5 State Championships, Omer won the all-around title with a 39.275 and first on uneven bars and balance beam. Omer was once again named in America's Top 100. She was ranked first in the nation on uneven bars. She also was in the top 100 on vault, uneven bars (6 times), balance beam (4 times), floor exercise 6 times) and in the all-around (5 times). After a successful level 5 season, Omer skipped level 6 and quickly moved up to level 7 for the 2013 season. At the State Championships, she placed in the top ten in the all-around with a 37.300 and fifth on uneven bars. Omer made America's Top 100 list for uneven bars (twice) and in the all-around. As a level 8 gymnast in 2014, Omer placed 19th in the all-around with a 37.775 and eighth on uneven bars with a 9.700. She qualified to the Region 3 Championships where she finished in the top 15 in the all-around with a 37.525.

Omer was unable to compete in 2015 due to an injury. While recovering from the injury, she moved to Metroplex Gymnastics in Allen, TX. She started competing as a level 9 gymnast in 2016. At the State Championships, she finished seventh in the all-around with a 9.425. She qualified to the Region 3 Championships, scoring a 9.625 on floor exercise. Omer had a great season in 2017 as a second-year level 9 gymnast. At the State Championships, she placed first in the all-around with a 37.725 and first on uneven bars and balance beam. She finished sixth in the all-around with a 36.100 and fourth on balance beam at the Region 3 Championships. Omer qualified to the Level 9 Western Nationals in Boise, ID where she finished fifth on balance beam. In the summer, Omer traveled to Israel for the Maccabiah Games where she helped the USA team to win a team silver medal. Individually, Omer earned a silver medal in the all-around. In August 2017, Omer and her family relocated to Florida, so Omer started training at Lakewood Ranch Gymnastics.

Omer qualified to the 2020 Level 10 State Championships but was unable to compete due to COVID-19 pandemic.

Omer trains over 16 hours per week at Lakewood Ranch Gymnastics in Bradenton, FL under coaches David and Laura Parraga. Omer is working hard to qualify to the Junior Olympic Nationals the next four years. Her long-term goal is to obtain a college gymnastics scholarship.