One of the key aspects to improving your vertical is strength + quickness. Strength gives you the capacity to generate force. You can build up your strength by working out. Mostly by working out the fast twitch muscles. The best exercises to do are leg presses, squats, or calf machines.
The quickness part is how fast you can generate the force of strength. This can be attained by doing the workouts a certain way. Such as going down slow with the weights and EXPLODING back up to the starting position. This helps to develop your fast twitch muscles.
If you’ve watched the video. You probably noticed that he seemed to have skipped a couple. Probably, due to the editing.
Another thing to note is since the creation of this video. Jacob has changed it from 10 to 9 essential variables. Which are listed below.
1. Strength
2. Quickness
3. Neurological recruitment & conditioning
4. Fuel
5. Stability and balance
6. Form
7. Flexibility
8. Body composition
9. Hereditary factors
All these are covered in great detail in his jump training program.