BMX is a synonym for BMX stunt riding, a sport branch that hails from extreme sports. It consists of five disciplines: street, park, vert, trails, and flatland. BMX can be traced back to 1975 when kids started riding bikes in concrete Escondido reservoir channels in San Diego, California. And, bike riders were seen in 1976 riding at Carlsbad Skatepark in Carlsbad, California. Skateboarder Magazine published photos of kids on bikes riding in.