Imagine trying to dunk that basketball with a couple more pounds pulling you down. Just when you thought that the effort you exerted is good enough, you realize that you fall short. Thus, the next time you jump up, you will exert much more effort than the previous one. This is the logic behind weight vest training. When you wear a weight vest while performing exercises to increase vertical jump, chances are you will exert much more force than necessary and when your body gets accustomed to this, you will be doing the same even without the weight vest. The result: higher jumps.
Weight vest training has been recommended by a lot of trainers. If you consult a jump manual, you will realize that weight vest training is actually one of the best accessories that you can invest in if you really want to leap higher. Weight vests add weight to your body without causing pain since it is strategically carried by both shoulders. Unlike having real extra weight, weight vests are easy to take off and wear so you do not need to exert the same amount of effort every time. There are different exercises that you could benefit from especially if you are wearing extra weights.
Aside from weight vests, there are also leg weights that you can wear around your legs since much of your power will be coming from them when you jump. This will make you push out more effort with your legs so muscle built can be further enhanced and jump height improved when you take out the weights.
Whatever training you wish to undergo, make sure that you have enough warm up before and cool down after. This will reduce injuries a lot and will help your muscles adapt to the rigorous training you will undergo.