Which of the following is an exercise that can help improve back extensor endurance?

The exercise that can significantly improve back extensor endurance is the bird/dog movement. This exercise specifically targets the muscles of the back, particularly the erector spinae, which play a crucial role in maintaining an upright posture and supporting the spine during various activities.

By engaging in the bird/dog exercise, individuals promote stability and coordination through the activation of both the back extensors and the core musculature. The combination of extending one arm forward while simultaneously extending the opposite leg creates a dynamic stability challenge, enhancing endurance in the back extensors as they work to control the spine and pelvis throughout the movement.

In contrast, while a plank can strengthen core stability, it does not specifically focus on the back extensors in the same manner as the bird/dog movement. Bicep curls primarily target the muscles of the upper arm and provide little benefit to back extensor endurance. Walking lunges focus on lower body strength and balance rather than the specific endurance of the back muscles. Therefore, the bird/dog exercise is superior for targeting and improving back extensor endurance specifically.