It's a good strategy for vertical jumping, if you focus on strenght training. Unfortunately, some trainees may forget, what is the goal of his training. Jumping is a skill, so you have to practice it. If you have bad jump technique, by perfecting it, you can add 2-5 inches immediately to your vertical.
Some articles about jump technique:
What Is The Best Vertical Jump Exercise? (by VerticalJumping)
Jumping Technique Tips (by VerticalJumping)
Unscrambling The Puzzle of the 1-leg Jump (by Higher Faster Sports)
Vertical jumping form can increase your vertical 2 - 6 inches now (by FreeVerticalJumpTraining)
