Jamie, the captain and star forward of the Comets hockey team, thinks everything is perfect. His two best friends, Jill and Brett, are amazing players too. The team is bound for the state championship. But when Jill is told she can't play on the boys' team anymore, and Brettt is hurt during a match, everything starts to fall apart. To make matters even worse, Jamie is pulled from his position to fill Brett's place at goal. Can Jamie make the adjustment...

Ninth-grader Kyle has always been the heavyweight on his junior high school wrestling team, but when a new kid shows up he loses the challenge and finds himself relegated to the B-team--until a girl on the squad suggests he move down a weight class.

Mason Williams is on his junior high school swim team, and he has always been fast at the short distances, but if he wants to compete in the longer races he will need to work on his endurance--so his best friend suggests that he train in the nearby lake.

Twins Domingo and Carmen Rivera are ready for the big Camp Rivals Race, when the four camps compete in an annual cross-country running competition, but this year there are problems: in the boys' race there is a pile-up, and Andy, Domingo's old friend, manages to prevent him from winning--but when Andy sends a text warning Carmen to watch out in the girls' race the twins become convinced that some of the other kids are cheating by working together...

Right after dance camp ends, Lily Richter's mother announces that the family is moving to a new town. Separated from her best friend, and enrolled in a larger unfamiliar middle school, Lily struggles to adjust, troubled by the feeling that her new dance team does not really want her.

Trey Smith, the captain of the Wildcats, knows he's one of the best players on the team. He doesn't worry about anything when he's on the court, until he finds out that his cousin Pete is on the opposing team and they're assigned to guard each other. How can Trey play when he'll have to beat his cousin to win?

At his old school fourteen-year-old Simon Wahlberg was the best player on his hockey team, but when he tries out for the Edgewater High School's varsity team he discovers that the competition is pretty fierce--and not just on the ice.

Because his father is in the Army, Oliver Jeffries has never lived in any one place for long, but he was hoping that Colorado would be different because he is the starting wide receiver on the Jackson Middle School's football team--so when he gets word that his family is moving again he is bitterly disappointed, but he has one more game and he is determined to make it a good one.

Nolan is the highly skilled punter of his school team, but he is less sure about taking over another position when their quarterback goes down--especially since he is also running for class president, and his competition for election is Tony, a linebacker on the team who is constantly belittling punters.

Sydney Todachine is looking forward to a summer on the beaches of San Diego before starting sixth-grade, but instead she finds herself on her Grandfather's ranch on the Navajo Nation reservation with no wi-fi, and while a couple of the kids are pretty nice, her cousin Hadley is as nasty as ever--but Sydney bonds with a spirited horse called Midnight, and together they start training at night for the upcoming rodeo.