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Begin standing in a staggered stance with your feet hip width and split approximately 2 feet front to back.  Dip into a quarter squat position by bending at the knees and hips while pushing your arms behind your body.  From this position rapidly accelerate your body upward by extending your hips, knees, and ankles and aggressively swinging your arms upward.  Using maximal effort, jump as high as you can vertically switching the position of your legs in the air.  When you return to the ground, absorb the landing with your hips and knees.  Reset in the start position, this time with the opposite foot in front, and repeat for the designated number of repetitions.  This drill can be performed as individual jumps or repetitively.  When performing repetitive jumps, as soon as you return to the ground jump again.