OK, heres the deal: vertical leap is a function of fast twitch muscle fibers in your legs. Its why Olypic powerlifters tend to have utterly gigantic vertical leaps.
Anything that works these fast twitch muscle fibers will help. Squats, leg presses, leg extensions, sprint workouts on a bicycle, whatever. The key is that you want more weight, less reps. That doesnt mean kill yourself under a 700lb squat. But if you are doing 20, 25 reps, its too little weight.
Both the fast and slow twitch muscle fibers are important in cycling. We do long base periods of endurance work to build the slow twitch muscle fibers (far more important to cycling) along with sprint intervals and hill work to develop a bit of fast twitch muscle to put out some power in a sprint for the line or to go on the attack. I guess the moral is dont get too caught up in power--it wouldnt matter if you had the most fast twitch in the world and were an incredible sprinter if you cant make it through the rest of the race. You arent doing this for cycling, but the moral still applies.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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