Warming Up & Cooling Down
In my personal opinion, Warming up is a nonnegotiable.
Below I have added the routine I created for my personal jumps program and have used since 2019. This routine has been many years in the making, and is continually being updated even now. I highly recommend that you constantly update your/my routine often to adapt to the athlete's needs.
Always begin with dynamic movements/stretches as this best prepares the athlete's body for the explosive and dynamic movements they will experience while competing. Many times I have seen individuals perform static (or stationary) stretching prior to competing. I personally believe this is bad practice, and feel those kinds of movements should be kept for a cool down instead.
The routine below is set up as a two-sided document. The front has ways to warm up and cool down; and the back has ways to STAY warm and loose prior to competing (if stuck in line waiting to jump for instance).
Printing it horizontally will give your athlete a half-sheet that can be theirs to keep and use as the season progresses.