One huge mistake that a few individuals come across is focusing too much of their time on strengthening their quads, and ignoring other affected muscles. Undoubtedly, this will give you very powerful quad muscles; however, this will not directly increase your vertical leap. This is due to the fact that all muscles must function synchronously in any jump. When a muscle group is stronger than the others, it will be put to waste because it cannot be used at maximum levels. Additionally, when it does reach its optimal level, the other muscles will be at risk of injury.
Contrary to some beliefs, too much vertical jump training is not going to do you any good at all. Continuous workouts will harm your muscles instead of adding improvement. The main reason for this is that muscular speed and strength will definitely increase along workouts and not during training. If you do not have any respect for a minimum downtime of 24 hours, the muscles will not have room for revitalizing and improvement.
Also, remember to put a good diet as your health priority. Lots of athletes found a considerable effect on performance due to changes on how they eat, and incorporating food supplements daily.