How to increase your jump vertical to at least 10 inches within 12 weeks. And how to do so by proper training, proper nutrition, and the right know-how. Jacob Hiller is the author of the Jump Manual, and he shows you in the book how marketers have been fooling us on this subject. Jacob struggled with this subject many years ago, but he's got a 40+ vertical now, and he's helping many athletes acheive their goals of being able to dunk with authority and grace. And you're Hispanic, or Cuacasian, you most probably have been bombarded with lies about different genes having different ammounts of fast-twitch muscles. That fact is true, but the difference is not that large, and can be easily evened out with correct training.