You have a really nice youthful, friendly tone! And you have great articulation going on. This isn't anything homework wise, but I do hear a lot of mouth noise going on. Some things that you can try to help with are: 1.) Drinking lots of water and staying hydrated all day, 2.) Green apples, 3.) Brushing your teeth before recording 4.) Make sure your mouth isn't right against the microphone, make sure you're a little bit away from it so it doesn't pick up as much.

I also like your energy with this and you got some projection going on which is great, but I want you to project a lot more to fit the scene of being in a gym with no microphone! Use your diaphragm and make your voice boom with power without straining or screaming.

Around the 1:15 mark your words get a little jumbled when you speed up, so make sure to keep the clarity of your words. It's great to have these variations going on, but just keep in mind your environment in the scene and that you need a whole gymnasium to hear you. Overall, great job!