"A good weightlifter imparts the greatest effort to a barbell, trying to accelerate maximally, when the bar is approximately at knee-joint height. There are two reasons for this. First, at this position the highest forces can be generated. Second, the force decreases when the movement velocity increases (parametric force-velocity relation). The barbell must approach the most favored body position for force generation at a relatively low velocity to impart maximal force to the bar. This two-phase technique is used by all elite weightlifters except the lightweight categories. These athletes are short (below 150cm), and the bar is located at knee-joint level in the starting position before the life. This is an example of how two extrinsic factors of force generation (force posture and force velocity) are combined to develop maximal force values."
- Science and Practice of Strength Training, Second Edition by Vladimir Zatsiorksy and William Kraemer
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