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Zatsiorsky, a respected Russian sport scientist who served for 18 years as chair of the Department of Biomechanics at the Central Institute of Physical Culture in Moscow. He discusses the accentuation principle in detail in his textbook Science and Practice of Strength Training. <br>Zatsiorsky says that if an elite volleyball player were to perform lower body workouts that consisted of partial squats, full squats and leg presses, 60 percent of the total work performed should be with partial squats and only 25 percent with full squats. One reason is that the weight used in a full squat is considerably less than that used in a partial squat (or the BFS box squat), and as such the most important portion of the athlete s lower-body strength curve will not receive maximal overload. (Incidentally, performing full-range exercises adheres to a workout strategy called peak-contraction training.)<br>Accentuation training is popular because it fulfills the requirements of exercise specificity. The principle of exercise specificity says exercises that have the most carryover to specific athletic activities share the same biomechanical properties as the activities the athlete seeks to improve. For example, because a power clean is basically a jump with weights, it would be a better exercise than a bench press for improving the vertical jump of a volleyball player. In fact, as I pointed out in my article  The Power of Giants in the Spring 2001 issue, shot putters who practice the power clean often have exceptional vertical jumps, even those athlets who weigh over 300 pounds. <br>Accentuation training is especially needed in such sports as figure skating, sincelthough you can t directly attribute all his lifting success to one exercise, it should be noted that in 1974 after Charniga began performing the exercise, he snatched 352 pounds, only 5 pounds off the American record in his bodyweight division.<br>In 1979 Charniga visited Russia and found that every gym he looked in had a glute-ham station, and that the exercise was an integral part of the training of Russian weightlifters. He saw that weightlifters would often perform some variation of the exercise twice in a workout, once before the workout with light weights as a warm-up, and again at the end of the workout with heavy weights as a strengthening exercise. This sensible practice was also followed in the U.S. In fact, five-time national weightlifting champion Ken Clark, whose picture appears in the BFS Total Program Book, began every workout with several sets of back extension exercises. In 1983, at a body weight of 220 pounds, Clark clean and jerked 470 pounds, an American record that has yet to be equaled.<br>While in Russia, Charniga noticed that not much had changed in regard to how the exercise was performed since that first Strength and Health article, with the exception that some gyms had positioned straps to secure the feet.  They simply didn t have access to materials, or the budget, to have someone make a sophisticated glute-ham developer for them. When Charniga returned to the U.S. and told others of his findings and his success with the exercise himself, resourceful equipment manufacturers began experimenting with designs for a glute-ham developer. The BFS glute-ham developer, with its adjustable foot plate and