Reinelt was part of the team that won the gold medal in the men's eight competition at the 2012 Summer Olympics in London. It was Germany's first gold medal in the event since 1988. He also won gold in the men's eight at the 2010 and 2011 World Championships and the 2013, 2014, 2015, and 2016 European Championships, and silver at the 2013, 2014, and 2015 World Championships. He was also part of a German team that won a record 36 consecutive races. At the 2016 Summer Olympics in Rio de Janeiro, he competed as part of Germany's men's eight team which won the silver medal. The eight rowers were awarded the Silbernes Lorbeerblatt (Silver Laurel Leaf), Germany's highest sports award, for their achievement. It was Reinelt's second such award having been similarly recognised for his 2012 Olympic gold.