Bodyweight step ups are a handy exercise that can be perfomred anywhere and with no equipment. For vertical jump performance they help build strength in all the key jumping muscles (quads, glutes, and hamstrings).
There are a number of technique pointers you can use to help perform this exercise better. Keep your back straight and stand tall. Ensure you are looking forward and that your feet are also facing forward. The higher the bench the more you will recruit your glutes and hamstrings. Before you start your upward motion it is also a good move to lift the heel of the back foot off the ground. This prevents you from cheating and pushing off from the back foot.
Some good alternatives to BW step ups are:
The step up is a terrific leg strength exercise for sure, but if you want to improve your vertical jump in the fastest way possible you need to check out our book Game Changers: The Most Effective Vertical Jump Exercises Known To Man. The exercises in this book are far and away the quickest results getting drills you can do to increase your vertical jump. Click the image below to find out more.