Cute voiceovers with catchy tunes. Also, a themed dance. i.e. broadway, diva. One of those World Cup Shooting stars-esque dances will make them pumped about entertaining, so they'll have a lot of energy. Entertainment value can go a long way.
As for stunts and tumbling, you need to get your kids to work at things. Don't let them fool around. From what I've seen, international teams tend to lack tumbling difficulty. As a coach, YOU need to teach them properly to prevent injury and so they can learn quickly. Teach them proper stunting technique as well so that they hit every time.