soso, they key is minimal ground contact time. You want to be expressing as much of your maximal strength as you can relative to your bodyweight when doing the excercises.

Whenever i do this sort of stuff its good to visualize yourself being the fastest you can possible be with excellent balance and coordination, tell yourself your gonna use all your effort.

For plyometrics such as 4 star drills/ankle bounces/lunge jumps i just try to spring of the ground while being coordinated and performing the excercises properly.

1 more thing, plyometrics are used to get the body to adapt to jumping higher. This is why you want to give it your all everytime you do them.

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Stay Motivated, Stay dedicated. Anything is possible with Work Ethic, You see it, You do it, You live it. Ball and Jumping is a way of life in which you excel once all effort is put forth.