Increase your vertical jump height—strengthen your hips and back legs!
Research on the biomechanics, or movement patterns, of the best high jumpers has found that when they perform a vertical jump, their hips contribute 40% and their hamstrings contribute 25%.
In the strength phase, use ground-based "weightlifting" movements to train these muscles, such as squats and deadlifts.
Studies have pointed out that there is a high correlation between the muscle strength of squats and deadlifts and vertical jump height.