hey guys, how about there is no such excercise to give you a quick 1-2 inch? period lol. The only thing i can see adding to your vert is dynamic stretching, vizualisation and getting psyched before you jump. That alone can put like seriously 5-6 inches on your jump.

__________________
Stay Motivated, Stay dedicated. Anything is possible with Work Ethic, You see it, You do it, You live it. Ball and Jumping is a way of life in which you excel once all effort is put forth.