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How Important Is the Knees-Bent Variation and What Makes It Different from the Conventional Leg Extended Exercise?
In the traditional leg extended variation, the hamstrings play a dominant role throughout a significant portion of the motion, with the glutes acting as secondary muscles, especially at the beginning of the movement when the hips are bent. As the hips extend, this dynamic changes, and the glutes become the dominant muscle group only at the end range of the movement.
By bending the knees, the hamstrings are positioned in what is known as active insufficiency. Their ability to contribute to hip extension is significantly diminished due to being shortened at the distal end. Consequently, the glutes become the main hip extensors throughout the entire range of motion. This ensures that the hamstrings are no longer the limiting factor in the exercise, allowing the glutes to take on the primary role. This variation uniquely isolates the glutes, enabling them to work from their fully lengthened to their fully shortened positions.