Jump in! (2007)

Seventeen-year-old Izzy Daniels (Corbin Bleu) is a star boxer and the son of a golden-glove champion. His eight year old sister, Karin, is crazy about Double Dutch and Izzy is asked to take Karin and her friends to a Double Dutch competition, where Mary and her team are entering. Izzy has often seen them Double Dutch and is always bothering them, but during the competition he acts out of character, standing and cheering along with everyone else.Izzy finds he has a crush on his friend and neighbor Mary (Keke Palmer), a member of the jump team The Joy Jumpers, who place fourth in the tournament. They make the city finals, but when Yolanda, the fourth member of the team, decides to quit and join their rival team, The Dutch Dragons, they face the prospect of forfeiting the tournament. Izzy, after learning of Yolanda's departure, quips "Why, did she finally figure out Double Dutch is lame?" Mary then challenges Izzy to speed jump, and when he does it much better than they expect, they ask him to join the team, but he refuses because of what his friends might think. When the other members of the Joy Jumpers, Keisha and Shauna, ask him to fill in until they find a permanent replacement, he finally relents. His conditions are that they practice before school and in his dad's boxing gym,