Nathan is 14 and from east London, the main venue for last year's Olympics and Paralympics.
His BMX-mad mates grew up around the streets of Tower Hamlets, one of the country's poorest areas.
Nathan says the facilities are much better now after London 2012. He's captain of a BMX club which trains at a track that was built only because of the Games.
It helps keep kids in the area out of trouble. "The club's really important because if we weren't at the club, we'd be on the streets," Nathan said. "It's given us somewhere safe to BMX."