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The overhead squat assessment (OHSA) is a cornerstone movement screen in NASM’s CES curriculum. It is designed to identify common movement compensations and dysfunctions, such as excessive forward lean, knee valgus, or asymmetrical weight shifts. By observing an individual’s movement while holding their arms overhead and performing a squat, the professional can determine whether there are imbalances in the kinetic chain—particularly in the ankle, knee, hip, and lumbo-pelvic-hip complex. This directly informs which muscles are overactive (tight) or underactive (weak) and guides the corrective strategy using the CEx continuum. Other listed assessments, like push-ups, walking tests, or body composition tests, measure fitness or health metrics but do not reveal movement dysfunctions in the same systematic way. Therefore, the overhead squat assessment is the most accurate for identifying excessive forward lean, making A the correct answer.