The double leg seated jump is great for improving explosive strength. This will help your body develop its ability to explode off the ground from a standstill.
To begin the double leg seated jump, find a chair or some other object that will allow you to sit with your thighs parallel to the ground. Once you’re in the sitting position, simply jump up as high as you can and land on two feet. Repeat the motion about 10 times.
You can also jump up on to another object to make the exercise more difficult. This is demonstrated in the video below.
Double Leg Seated Jump Video