all you small hoppin young bucks, here's a way to increase your vertical by 3-5 inches in one workout!!
http://www.jumpusa.com/blog/2012/10/
I, for one, am going to incorporate stretching, glute bridges, and lunges into my leg workout today to see how much higher I can jump tomorrow.
I guess I got lucky, never had to do any workouts when I was younger and I was able to dunk (9th grade).
But, once I started focusing on my legs I could really get up, 1 step vert was 38" at 208lbs. If you're a two footed leaper, jumping squats, calf raises and jump boxes are the way to go.