When Toby Morton's sister asks him to play hopscotch, he asks if there's a video game version.

He hates physical activity, and he especially hates gym class at his New Brunswick school. If the kids on his team in gym tease him for being overweight, he goes out of his way to make sure they lose. So when his new homeroom teacher, Mr. Walker, asks Toby to join the running team, Toby thinks he's crazy. But when his friend Amy suffers a dangerous attack of asthma, Toby is forced to look at exercise in a different light.

Walker's Runners is a lively story for young people that introduces the joys of physical fitness, while highlighting the high costs of inactivity.