When I time high school cross country races or spectate high school basketball games, I still see kids sitting on the ground static stretching, getting ready for battle and I wince. Static stretching is dead and you won't find the Colorado Coyotes performing static stretches.
It reminds me of Zombieland when talking about limbering up and Woody Harrelson responds "I don't believe in it. You ever see a lion limber up before it takes down a gazelle?"
All joking aside, there is a better way to get ready to race than static stretching and that's a dynamic warmup.
The coaching staff for the Coyotes will teach your youngster a proper dynamic warmup. We're also going to over body weight exercises such as air squats, lunges, jumping jacks, pushups and burpees. Working on proper form and movement and preparing your runner for the future.
In fact we will also incorporate some HIIT (High Intensity Interval Training) from time to time, to vary up the workouts, have some fun and build strength.