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A good number for ELPF would be anything greater than 2.50 (Athletes with an ELPF less than 2.50 need to work extra hard on the quick lifts such as the Clean and Snatch). For the athletes jump height, a good performance number would be anything greater than 20 inches. <br><br>SPRINT<br> TIMER MODE<br><br>This mode is designed to accurately measure an athletes running speed. The computer is sound activated so when the coach yells  GO or blows his whistle, the time starts; and when the runner finally steps on the mat at the finish line, the time stops. <br>A feature we found impressive in this mode was it s ability to compensate for the time it takes the sound of the coach s voice (or his whistle, etc.) at the finish line, to reach the runner at the starting line. <br>The Just Jump or Run allows for a more accurate time in two ways. First, of course, is the elimination of the sound-wave, travel-time discrepancy and second, the elimination of human error due to the reaction time it takes for the coach to stop a conventional timer. <br>It is quite simple to use the Just Jump or Run for timing sprints (see illustration 3). First you need to measure the desired distance of the run (40 yards for example). Second, place the computer and mat at the finish line. Third, enter the distance of the run into the computer (this must be done in feet, so if you have 40 yards you would enter 120 feet). Now, once the runner is set, yell  GO or blow your whistle and wait for the runner to finish by stepping on the mat. <br><br>CONCLUSION<br><br>The Just Jump or Run is not just limited to the ideas presented in this article. You can make up endless drills and tests to use with it. <br>Because of it s versatility along with it s accuracy and efficiency, the Just Jump or Run is a great buy. what they could have done if they had taken better care of themselves."<br>A major portion of Amy's training is the Olympic lifts, but she also performs several auxiliary lifts for the lower back, abs and the upper body. "It's important to keep the upper body strong for coordination," says Amy. "At the takeoff you really have to move the upper body--you can't just be a limp noodle." She also says it's important for umpers to perform specialized exercises for their ankles. "You get a lot of power from your feet, and if your ankles are hurting you're going to suffer. I do all kinds of ankle strengthening, such as picking up sand and runnig on the toes to strengthen the arches, surgical tubing exercises, and rocker boards--I work on my ankles a lot."<br>For younger jumpers, Amy believes in the importance of being exposed to a variety of sports. "You learn a lot through other sports and through competition. It's just like your academic studies-you need to become a student of your sport and learn all there is about it. The high jump takes a lot of technique, but you can't stop there. You need to learn the mechanics, the physics and the psychology of the jump to really succeed."<br>Amy has given quite a bit of thought to the psychology of sports and believes there ar some truths behind the stereotypes about track and field athletes. She says that sprinters are confident, bordering on cocky; throwers are the jokers and are laid-back; pole vaulters are the daredevils, and distance runners tend to engage in strange rituals and habits that she feels border on "just plain weird." She also says that because decathletes have an appreciation for all the events, they tend to make a lot of friends and, she adds, "have the nicest bodies."<br><br> <br>Posing for Perfection<br><br>Although her plate is full with athletics and studies, Amy doe