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Begin standing upright approximately 1 foot away from the box you will be jumping to.  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 and land on the box.  When you land on the box, absorb the landing with your hips and knees.  Try to be as quiet as you can when you land on the box.  You should not stomp your feet into the top of the box.  Step down from the box, do not jump down, and reset for the next repetition.  Use a box height that is appropriate for you.  If you can still land effectively using a higher box, do so.