There is a jumping program called Air Alert 2 which takes 12 weeks. There's no equipment involved, just a workout which gradually increases each week. It claims to increase your vertical by 8-12 inches but I didn't finish the whole 12 weeks due to back injury. I got an increase of 3" around week6 and 3" more by week8 (when I stopped). I know a bunch of people who swear by it (black and non-black) plus I've seen results from my own trial. If you can't find the program on the web (it's just a chart and some pictures explaining each exercise) PM me.
Also, the first two weeks you actually lose some vertical because your legs are just not used to getting worked like that. It takes dedication, too: 5 days a week for 12 weeks. Good luck in your search for the workout most suitable for you!
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