Sand volleyball is a sport that requires more jumping ability than other sport. When there are only 2 people, you have to be able to jump high or you will never win a game.
Find the right vertical training for volleyball is difficult but there are many jump programs to choose from.
In a jump program you need to look for a few key factors to know if it is going to be worth your time.
One like the Jump Mentor is a great example of how they should be. You should see a guarantee of some sort so that you know it is a legit program. You should also be able to trust the creator of the program and know that they are honest and believe in the product that they have created.