This crossfit exercise is great for jump training because it strengthens your legs while mimicking the same crouch and explode movement you’ll make when jumping. A surprising benefit of this exercise is your arm action. The catching and throwing helps you coordinate your arms with your legs (timing is critical for maximum jump).
The Wall Ball
The exercise can be incorporated into a circuit including a few other leg-focused explosion exercises such as jumping rope and sprints.
A decent substitute if you don’t have the right equipment is air squats or goblet squats with a full extension at the end.