Born January 21, 1998, in Hamilton, Ohio, Hundley started tumbling at the age of four in the dance studio run by her mother, a professional tumbler. She proceeded into gymnastics and by age seven was competing in the level-5 2005 Gatlin Classic. In 2006, she won the all-around, balance beam and floor exercise titles at the Fiesta Bowl Invitational. By 2007, Hundley had advanced to compete as a level-7 gymnast, and in 2008 advanced again to compete as a level-10 gymnast.
Junior career
Hundley, as a junior international elite gymnast from Cincinnati Gymnastics Academy in Ohio, participated in the gold medal-winning United States team at the 2012 Pacific Rim Gymnastics Championships. In June 2012 she competed in the VISA Championships, also known as the USA Gymnastics National Championships, improving her AA score from 56.750 to 57.250. In March 2013, Hundley participated with the United States national squad in its group performance in the City ofJesolo Trophy, in Jesolo, Italy.
Senior career
Hundley's senior debut came at the Secret U.S. Classic in August 2014, where she placed 6th AA, advancing to Nationals. At the 2014 P&G Gymnastics Championships, Hundley placed sixth in the all-around, seventh on the balance beam and floor, and eighth on the uneven bars. She was named to the national team and the Pan American Championships team. At the Pan American Championships, she won a gold medal in the team competition. At the Pan-American Games in Toronto, she was part of the US team that won gold convincingly. She also won silver on the floor exercise, with a score of 14.200. On the uneven bars, she was the lead-off competitor with a score of 14.650, winning bronze. Her teammate Rachel Gowey won gold with a score of 14.725. Hundley also placed fourth in the all-around at the Pan-Am Games. Hundley competed on the first night of the P&G National Gymnastics Championships. She slightly tore her meniscus on her first tumbling pass on floor, her first event. She continued the first night of competition. At the end of night one, she was in 9th place. She withdrew for night two due to the injury she sustained on floor exercise. Despite her injury, she was named to the Senior National Team and is invited to the 2015 Worlds Selection Camp in September. On November 11, 2015, she signed the National Letter of Intent to the University of Florida. On February 29, 2016, USA Gymnastics revealed that Hundley would represent the United States at the 2016 Stuttgart World Cup on March 19. In March 2016, it was announced that Hundley would replace the injured Nia Dennis at the 2016 Stuttgart World Cup in Stuttgart, Germany. This event concluded the C IIIFIG World Cup Series and competitors were vying for the All-Around title. Hundley had strong performances on every event except uneven bars, where she faltered slightly, scoring a 13.266. However, due to her three other strong events, Hundley placed 3rd All-Around, winning the bronze medal with a score of 56.499.