If you want to increase the size of your jump then you're going to need to exercise a lot of different muscles. There are lots of exercises that you can do and I'll leave it up to you to decide what exercises to choose, but we're going to look at what muscles and areas of the body you need to workout. It's important to train consistently if you want to maintain your vertical jump because over time your body will become less in shape and therefore your jump will also suffer.
1. You should do some exercises every single day so that you can build up the muscles in your abs. When you're jumping you will need to use your abdominal muscles to power your leap. You will need to make sure that you do exercises every single day and not take any time off.