First & foremost, you don’t have to box jump. You don’t have to be able to jump the height of a car in order to prove your fitness “worth”.
But… if you are intrigued by a box jump - and assuming your knees and pelvic floor can handle the impact - let’s talk about how you work up to it.
Master a squat jump; in essence, this is what a box jump is. You lift off from a squat and you land in a squat… a squat jump. The barebones of a squat jump are proceeding into a squat, lifting off the floor and landing (lightly) back in the squat position - worth being able to do this without pain or problems before proceeding to new heights!
Start small; don’t be thinking you’re going to master a 24’ box on your first attempt - you may but, if you’re anything like me, you gotta start small. I started with curbs; facing the curb, proceeded to squat then lift off into a squat jump and land back in a squat on the curb.
Once you are comfortable with smaller heights, starting incrementally adding more height; this may be jumping to steps up the stairs or if you have access to a box with risers start with one or two risers each side and then add more as you become more comfortable.
Once you’re at a similar height, if not the same height, transfer over to the box and give it a go! Remember, you can also take it back at a step (no pun intended) and revert back to jumping smaller heights until you’re **uber** comfortable with the height of a plyo box.
Have fun & be safe!