Which flexibility assessment is specifically designed to evaluate trunk extension?

The shoulder lift test is specifically designed to assess trunk extension flexibility. This assessment evaluates the range of motion in the lumbar spine and thoracic regions as the participant lifts their torso from a reclining position. The focus on trunk extension means that individuals must demonstrate their capability to extend their spine backwards, which is critical for activities that require lifting the upper body against gravity.

In contrast, the sit and reach test evaluates hamstring and lower back flexibility, placing emphasis on forward bending rather than extending the trunk. The stork test measures balance and stability rather than flexibility, and the timed sit-ups assess muscular endurance rather than the range of motion associated with trunk extension. Therefore, the shoulder lift test is the most appropriate choice for evaluating flexibility in trunk extension specifically.