Your vertical helps you every in any sport you will ever play. Whether you’re dunking on the basketball court, spiking a volleyball, jumping over a safety to make a catch, or doing jumping events on the track, jumping higher will always give you the edge. The best exercise to jump higher is without a doubt a box jump. Not only does it work every muscle jumping requires, but its great cardio to keep your body fat down.
Your box needs to be high. Mine is a little bit less than half of my height (It comes to my upper thigh). I do 3 sets of 15 repetitions. your reps need to be fast to be sure you increase your explosion, which is all jumping is.
After doing this exercise for 4 weeks my vertical has improved by a lot inches.