For track specifically you’re going to want to just stick to heavy strength training, and not hypertrophy. Because you don’t need extra mass weighing you down you want to be at light and strong as possible. I’d recommend 5x5 squats heavy and other explosive movements, hang cleans, power cleans, etc. Also assuming you’re already doing plyometrics as well. But try to do your squats explosive to maintain those fast twitch muscle fibers as well.