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PLYOMETRICS:</STRONG></DIV> <DIV align=center>&nbsp;</DIV> <DIV align=left>There are three levels of ploymetrics that help jumping power.&nbsp;First is lower level drills of skipping, hopping and jumping drills with no accessory apparatus.&nbsp; Second is medium level drills using some form of apparatus, starting and ending with feet on the ground.&nbsp; The third level is Plyometric Box Jumping.&nbsp; We start with low intensity Box Jumping drills that&nbsp;any high school athlete can perform.&nbsp; Our drills increase in intensity and skill but over half of our nation's high school&nbsp;athletes can complete all of our drills in the first week.&nbsp; </DIV> <DIV align=left>&nbsp;</DIV> <DIV align=left>At BFS clinics where Plyometric Box Jumping is included, we select about ten athletes to demonstrate.&nbsp; We always try to choose a wide variety of size and skill in these athletes.&nbsp; They stretch well and then give each athlete three Vertical Jump attempts on our "Just Jump" measuring device and three&nbsp;Standing Long Jumps.&nbe, while the spine is subjected to the full load on the bar. In other words, the legs and spine in controlled squatting are exposed to significantly less force than in running and jumping. Normally, exercises such as squatting will be done no more than twice a week for a total of about 60 repetitions, while the running child will run every day and subject the body to those many thousands of impulsive foot strikes. <br> It does not require much scientific knowledge or computational genius to see that the cumulative loading imposed by simple running activities on the lower extremities and the spine is far greater than the cumulative load of two or three tims a week of weight training. Does this now mean that we are justified in recommending that children not be allowed to run, jump, throw or catch because biomechanical research definitely shows that such activities can produce very large forces on many parts of the growing body? <br>It should be obvious then that there is nothing wrong with running and other normal activities of childhood, and therefore no reason to disallow activities of lesser impact, such as carefully structured programs of weight training.<br>Siff also notes that bone density scans hve proven that youngsters who do competitive weightlifting (i.e., the snatch and the clean and jerk) have higher bone densities than children who do not use weights, and that clinical research has not shown any correlation between weight training and epiphysial damage. Further, an extensive Russian study on young athletes, published in a book entitled School of Height, conclded that heavy lifting tends to stimulate bone growth in young athletes rather than inhibit it.<br>Two possible reasons for the fear that weight training could stunt growth are that weightlifters tend to possess more muscle mass than other athletes and that smaller athletes are attracted to the sport. In gymnastics, the average height of elite athletes has steadily declined in the