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There are two types of muscle tissue, longer fibers that are better for endurance and strength, and shorter, bunchy fibers that are "twitch muscles" good for sprints and short powerful movement. People have different combinations of each. If you have lots of longer muscle fiber in your legs, you can train the twitch muscles you have to be very good at sprints, but if you have more long muscle fibers, you'll never be an olympic sprinter. Same idea with marathon runners.
Still, it doesn't seem like you have the olympics in mind. When training, try a few very powerful quick movements (after a very good warm-up) but don't overwork the twitch muscles, they get tired and torn fast.
On another track, if you're having trouble with those quick jolting movements, work on flexibility and balance. Its not the muscle, its how you use it. Work on lifting from your center, staying balanced, moving lightly and fluidly. Take dance classes. If your broken-backed pirouette doesn't set you up for the perfect layup, at least it'll have 'em laughing too hard to block your shot.
Seriously. Dance classes... or martial arts. The early classes focus on the same skills, and if you've ever been to an audition, you'll know just how much of a martial art dance can be.
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