Correct Response: D. When lifting a steady amount of weight, the amount of strength an individual uses varies relative to the position of the weight in the individual's range of motion. During a standing barbell curl, the lifter's maximal strength production by the elbow flexors occurs while the elbows are bending, but not fully flexed or straight, which are the weakest points in the range of motion (A). The generation of strength does not remain constant through the entire motion (B). As the barbell is lifted above the waist and the elbows approach full flexion, the generation of strength declines rather than increases (C).
