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The best answer when it comes to How to Jump Higher is bulk up those fast-twitch muscles by focusing your workouts on building a strong thigh muscle group, first and foremost, and the rest of the leg muscles will benefit, as well. When it comes to building the fast-twitch muscle groups, it is often better to do so with lighter weight and faster, repetitive exercises to build bulk. Strong vertical jumpers may be genetically inclined to have more fast-twitch muscle fiber; however, it is possible for anybody to become a great jumper when they are able to bulk the amount of fast-twitch muscles they have.