One morning a week later, the gym at the Y was empty. I picked up the same mini-ball and unsuccessfully tried to throw it down. I found the more relad I was, the higher I could jump. So I loosened my shoulders, took a depth breath, and approached the rim. I held the ball for a beat longer this time, and easily popped it over the rim. It felt incredible. I did it a few more times, each easier than the last, pulling down on the rim with unnecessary force for maximum satisfaction. But as exhilarating as it was to dunk again, I was only using a mini-ball—I hadn’t completely reached my goal.
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variations: The vertical jump test can also be performed using a specialized apparatus called the Vertec. The procedure when using the Vertec is very similar to as described above. Jump height can also be measured using a jump mat which measures the displacement of the hips. To be accurate, you must ensure the feet land back on the mat with legs nearly fully extended. Vertical jump height can also be measured using a timing mat. The vertical jump test is usually performed with a counter movement, where there is bending of the knees immediately prior to the jump. The test can also be performed as a squat jump, starting from the position of knees being bent. Other test variations are to perform the test with no arm movement (one hand on hip, the other raised above the head) to isolate the leg muscles and reduce the effect of variations in coordination of the arm movements. The test can also be performed off one leg, with a step into the jump, or with a run-up off two feet or one foot, depending on the relevance to the sport involved. For more details see vertical jump technique.
High pulls can also be done using a dumbbell or kettlebell,. When doing so, position the weight between your feet and pull with one arm at a time (switching arms halfway through the set). A trap bar (aka, hex bar) is also an option, particularly for individuals who have a hard time keeping the lower back flat; the trap bar allows the hands to be positioned behind the shins to help pull the shoulders back.
The method described above is the most common and simplest way to measure one's vertical jump, but other more scientifically accurate methods have been devised. A pressure pad can be used to measure the time it takes for an athlete to complete a jump, and then using a kinematics equation (h = g × t2/8),[4] the computer can calculate his or her vertical jump based on the time in the air.