hey guys, i found this thread and forum while i was googling on increasing vert. i know abit about it as i increased my vert from 60cm to 93cm over the period of a year and a half through strength training and plyometrics.
i really suggest you get a guide on how to do it, there are books out there that go in depth increasing your vert and come pre prepared with routines to match your ability, nutrition plans and other useful stuff.
i know cos i've used one, its worth it if you're going to stick to it.
firstly to jump higher, you need to strengthen your posterior chain. which is your glutes, hamstringes and to a lesser extent, calves. your lower back is also very important as the power generated by your legs can over time be too great for the landing impact - for your lower back to handle.
what im saying is, your legs put you too high in the air, and when you land your lower back cant take it.
so your need to train your legs, and lower back.
how does one do that? its pretty easy, you find a strength routine such as a 5x3 or a 5x5 routine and an appropriate split.
your routine should be HEAVY weight, LOW reps. dont worry about speed just yet.
squats, front squats, deadlifts, RLDL, weighted pistol squats, weighted one legged squats, lower back hyperextensions with weight, etc
you can vary the exercises to keep your body guessing.
once you can squat about 1.5 - 2x its time to move onto plyometrics, a good plyometrics program is pretty much essential cos its really not something you just jump into (lol at pun)