Eros Pista is a type of racing track that people ride their bicycles on in a special way called "track cycling". It's like a big circle that goes around and around, and the riders go really fast! It's really popular in Europe, especially in countries like Italy, where they have big races and lots of people come to watch. The riders wear special clothes called "skinsuits" and use special bikes with no brakes and only one fixed gear. It's really exciting to watch because the riders have to be careful not to crash into each other and they have to go super fast to win!