First off let me explain this picture. It seems almost impossible to find a good resistance band picture on the world wide web. So I settled for a picture of Terrell Owens doing band shoulder presses in a body of water. Why do band exercises in water? I will answer this question like a politician with another question. Why do bicep curls in the middle of your driveway during an interview? Because context is king.
When your training plyometrics you are training for rapid force development in three planes of movement, the vertical, horizontal, and lateral horizontal.
Examples of each.
Vertical Plyometrics: Hops, Jumps, Box Jumps, etc.
Horizontal Plyometrics: Forward Hops, Broad Jumps, and the like.
Lateral Horizontal Plyometrics: Lateral Broad Jumps, Single Leg Push Off, Hydens, etc.
These movements are foundational movements in teaching power and more importantly teaches how to use the hips. These movements are beneficial to all who want to develop these attributes.
There comes a time when you need to make these exercises a little more challenging. This is where weighted vest coming into play and more to the point of the article bands. By increasing the resistance you have to develop more force to move yourself against the bands tensile strength. In return increasing force and ultimately increasing power.