In this book, Ponyboy is a pretty good track athlete at his high school. I do not know that he is a star, but he is quite good at it. He mentions this a number of times in the book.
One place we see this is in the part where the newspaper has an article about Pony and Johnny rescuing the kids. It talks about their home lives and, in Pony's case, it talks about how he is a good student and a possible future track star. Pony says at this point that he is the youngest kid on the varsity track team.
Ponyboy is a great track athlete and very fast at running. He was actually the youngest person on the varsity team
He excel in track but also loves to play football.
He is a runner , a fast one in this book