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XlOKI+Bk0鑎Ȫ_'h*BNy_ž<1rU4i-J[RK\o4box and doing a forward throw with a medicine ball or shot. Multi Jumps into sand and eventually over hurdles in the static and dynamic mode are a part of the annual plan. Once again, gradual progressions are implemented based on the athlete s overall strength. One thing to keep in mind is when an athlete sprints at maximum velocity with their spikes on, they re doing plyometric work. Some coaches forget that, and this can lead to overtraining.<br><br>BFS: Do you believe that many sprint coaches perform too many sprint drills?<br>DS: Drills are important only if they are performed with quality concentrated effort and actually accomplish the objective, which should be to develop strength and improve mechanical movement. It s also important to distinguish between sprint drills and mobility exercises. A mobility exercise may look like a sprint drill, but it s really just working the full range of movement in the hip joint.<br><br>BFS: Regarding injuries, I understand Dr. Michael Ripley works with your athletes. How has he helped your program?<br>DS: I ve known Dr. Ripley for more than five years, and he is undoubtedly the best sports doctor I have had the pleasure to work with. We ve incorporated a great many of hisideas into our program; his breathing techniques for stretching are especially valuable. I would estimate some athletes I have worked with have boosted their performances by two- to three percent from followiop 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 o 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 tP^BOo1@ =^0iX^CI'Һ*(;?eRxY5:r % H7:9JB{(r3m~VyZEKQ@Odn~}{VTi V+7 x니'C~WJssO[Esp*ޞㅿƘE- xjM1z ui:UYf$I&H6`b&Yb ~4OK ?WK5rCcwvGGSї#̵}5rd~T&~VZ3 j|@a{`$ TգsgGAz> ;y{VEB=8:+{/]bwܵO`ea\?9A 1Su={6F$fa]5g Awa|c3ՙ(/qUʴ2J;cIk} ֵ ~=O% X_HˑX'zʿG?'R[h#_Ÿ_[j/me;o}=M*G݋/b>0(4*GN%Z БQB:vǏ2 r ]2ʝ,+gxJqsYյۗMiR!y8Ɔ:oۿˋhڨn`Hd! 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