In our experience, the most overlooked part of training for high school athletes is the cool-down & recovery period. At PLT4M, we use a number of different static stretching routines (like the Band Stretch above), mobility work, and foam rolling as our final piece of each training session.
Want to build more powerful athletes? Most coaches would agree that incorporating lifts like the clean is a good start. The clean is an explosive, athletic movement, utilizing the entire body that can drastically increase power output.