Execution: On the descent let your arms relax and hang down. Squat back slowly, don't allow your knees to travel forward, keep your lower back flat.
The dumbbell will eventually touch the ground in between your feet, not in front of them. The touching of the dumbbell to the ground should be thought of as a trigger, once you feel this, jump straight up as fast and as hard as possible. Do not bend your arms during the jump. This exercise can be performed for 3-4 sets of 8-15 reps.