Junior Leyva competed at his first Winter Cup in 2006. He went on to compete in the junior division of the
US National Championships, where he came 1st all-around, won gold on floor exercise and horizontal bar, and tied for silver on parallel bars. and at the National Championships won the gold medal on the horizontal bar and the silver medal on the parallel bars. He was chosen as one of four US male gymnasts to compete at the
2009 World Artistic Gymnastics Championships in London. He qualified for the horizontal bar final, where he placed 4th. He rallied for event finals, winning gold on parallel bars.
2012 Leyva won medals in several events at the
Winter Cup, then won the American Cup in New York City. He placed 2nd in the all-around at the National Championships in Saint Louis, behind
John Orozco. He defended his national titles on parallel bars and horizontal bar. He went on to compete in the Olympic Trials in San Jose, where he came first with his combined scores from the Visa Championships and the two days of Trials. This secured him an automatic berth on the US Olympic Team, alongside Orozco, who finished in second place overall. The next day, it was announced that Leyva and Orozco would be joined in London by
Jonathan Horton,
Sam Mikulak and
Jake Dalton, with their 2011 Worlds teammates
Alex Naddour,
Steven Legendre and
Chris Brooks as alternates. Leyva earned the bronze medal in the individual all-around at the Olympics.
2016 Leyva, originally an alternate, was added to the 2016 US Olympic Team in July 2016, following the withdrawal of Orozco due to an
ACL injury. On August 6, 2016, the men's team qualified for the team final in second place. Leyva qualified individually for individual event finals in both
parallel bars and
horizontal bar. On August 16, Danell won silver in the Olympic men's parallel bar final with a score of 15.900. About an hour and a half later, he won another silver in the horizontal bar final, scoring 15.500. Despite being originally named as an alternate to the team, Leyva is the only member to walk away with two medals, contributing to the US men's gymnastics team's total of three medals, along with Naddour's bronze on the pommel horse. ==Personal life==