When Piteous was born in 1986,he had no legh below his knees. He has had artificial legs since childhood,but this never stopped him from doing many different sports. Pistorius began competing as a runner in 2004. Each year, his prosthetic legs were lighter and better,and each year, he was able to run faster and faster. One of the keys to his success is his preparation and hard work. The other key to his success is his prosthetic legs, which are the most advanced in the world