I think you get good results with VJB.
But if i do only plyometrics and no strenght or anything how many inches i lose in my gains? I mean where can i get most results, plyos or strenght training?

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Age - 13
Height - 5.6
Vertical jump - 30"
Programs:
VJB Beginner Plyometrics - done
VJB Bodyweight Strenght - done