C

The study that specifically examined this question reported that concentric leg-extensor power showed little or no correlation with change-of-direction running speed, whereas only one component of muscle power—reactive strength measured via a drop jump—displayed moderate, significant associations. Overall relationships were “not consistent,” leading the authors to conclude that while reactive strength may contribute, other technical and perceptual factors also play major roles in agility performance [Young et al., 2002, PMID 12094116]. Hence, the evidence is inconclusive rather than clearly affirmative or negative.