How to improve fast twitch muscle fibers?
For explosive movement
Weightlifting works fast-twitch fibers more than slow-twitch. ST fibers are more for elastic strength and endurance, like yogis (people who do yoga).
As for jumping higher, check out plyometrics.
http://www.netfit.co.uk/plyometrics-web.htm
Do that workout one week, and your squat/extension, whatever your lifting leg routine is the next. Build strength and muscle, and convert it into jumping power.
best of luck
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