The most important aspect of sports nutrition for youth athletes is to make sure they don't get dehydrated. Teens have a decreased ability to assess thirst cues and are more prone to dehydration, so make sure they are drinking fluids.
Getting a good amount of complex carbohydrates before a workout will help fuel the body. Here are some great pre-workout Blast recipes, make sure you cook the quinoa and sweet potatoes before using: https://nutriliving.com/recipes/orange-you-regular, https://nutriliving.com/recipes/quinoa-migraine-elixir. It is important to try out foods, portion sizes and timing before you are in a race situation. Especially when you are sprinting, having foods that sit well in the stomach, are crucial for optimal performance.
For post workout Blasts you can check out these recipes: https://nutriliving.com/recipes/beet-competition, https://nutriliving.com/recipes/peanut-butter-push, https://nutriliving.com/recipes/scrumptious-vanilla-shake-blast