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Championship.&nbsp; There is no coach in America who cares more for his athletes or works harder than Mark.&nbsp; I would also like to thank Mark and the Yucca Valley Football team for inviting me to their celebration dinner at Mark's house.&nbsp; I feel truly honored to have been able to speak in front of this exceptional group of young athletes.</EM></STRONG></P> <P><STRONG><EM>-John Rowbotham:<BR>Yucca Valley's BFS Clinician</EM></STRONG></P>e Spring 2001 issue, shot putters who practice the power clean often have exceptional vertical jumps, even those athletes who weigh over 300 pounds. <br>Accentuation training is especially needed in such sports as figure skating, since the additional bodyweight developed from full squats could add extra muscle mass that would decrease jumping height (and, for some athletes, adversely affect the aesthetics of the performance, which greatly influence the athletes placement). Other athletes who may not want to develop additional muscle mass from emphasizing full squats are gymnasts, divers, high jumpers and even swimmers. <br>Let s examine the box squat in more detail by looking at the concept of starting strength.<br><br>Getting a Head Start on the Competition<br><br>First, it s time for some more definitions. During a concentric contraction a muscle develops tension and shortens, causing movement to occur. During an isometric contraction a muscle develops tension without a change in joint angle; thus no external movement occurs. And during an eccentric contraction, a muscle develops tension and lengthens, also causing movement to occur.<br>One factor that makes the box squat especially effective for sport-specific training is that the exercise requires the athlete to perform a concentric muscular contraction after a prolonged isometric muscular contraction. The effect of this on performance is that the pause (isometric) phase dissipates the stored energy (part of the plyometric effect) that develops during the lowering (eccentric) phase of the lift, energy that would otherwise be used to help during the lifting phase. <br>In powerlifting competition, research has shown that an extra second delay waiting for the judge s signal to press the weight off the chest in the bench press could result in a five-percent difference in the amount of weight lifted. This is one reason that although it has been allowed in competition to have spotters place the barbell on the chest to begin the lift, it is a technique seldom used because there is virtually no plyometric effect with this technique (besides the fact that you have to have well-trained spotters to properly place the weight on the chest).<br>In certain sporting movements, an isometric contraction in the set position precedes a concentric contraction, but t&j]Np\^)oL& Z\iMf~|<ŊrbDK&0͔m Ը ͚ o0kaBs2è֓DMJSRM6~_Zq1K)ɉv~XZM8RJ2ʄnOdvNYYr/kqqT8Cc?Ρ&?cg*OOS­i2Gq>GV>]GR]++[1n.K9Q"^FWnOlXQ2Prvpc)c;?ŷ wduIu;!vviVAHû]Bffx`g̎~w?XJ\]Y@Q⒎a Z?淆~.݈̗ `}oZlgXٍT%fy? zW]\75$DS'Ϛ4Yu8.S^RY )I4+(N-~ZJK;,_NJs%/NL',1cv`Oϥ ."!F!IVof'5n5<<1''z8eF"19>\9/)2ܨ7{JM^_UnGQ{x X4J_B\zrkkb9? %v'2z oRpnIr*6Ey ٢FjZzI]}acL5 b#T,` 'L[ysX6۹*-ru:1[ xtWXC5.У,)CIyш'DJe7Y{;˾f}Tvcra{I4NDDLu?~7.,AЏLw9)PHmQ"ik~_I4VQndF_ a5v9YGgG)gjhal@6F¬9x:"阧y˶Si`\CsM!5Ƥ\<PO]I܎sojCkS>drN16#I;|@'Z3G9{i4c;rS ZcFFjh(f,Amy.?Hx]bf oqWĸY%@nK! 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