Your jump can divide into three phases. When you load up the muscles for the jump, it is the eccentric phase. The concentric phase is actual upwards explosive movement. The phase number three that is the amortization phase, and occurs between the first and second phase.
Additionaly, to jump higher, you must focus on four factors and work on them.
1. Movement Efficiency
2. Body Composition
Movement efficiency is the same as coordination.
Skinny people jump higer, so when you want jump higer – reduce unnecessary weight.
Strength in terms of jumping is essentially how much force you can apply to the ground.
Jumping speed is a combination of your rate of force development (RFD) and your reactivity. RFD is how quickly you can access your strength to produce your jumping power and reactive strength is how quickly you can do your full up and down jumping motion without loss of performance.