YA Book about a runner...

[teyrnon]

There was a YA Book I purchased on my way to the airport and read on a flight circa 1990. The main character was a runner who had an injury and was supposed to stay off his feet as much as possible. He was scolded by a doctor at one point because he kept at running practice anyway. At some point, he got a girlfriend and that's pretty much all I remember about it.