As the definition of agility has been constantly evolving throughout the literature, so too has the mechanisms and methodologies by which it has been tested. Strength and conditioning coaches have typically employed pre-planned sprints with changes of direction in order to test for agility (3,15). Recently however, research has begun to focus on testing the reactive component of agility (6,8,15), since skilled athletic performance typically requires highly developed visual-perceptual motor-skills that are crucial to this quality (14).
Holding, R, Meir, R & Zhou, S 2014, 'Assessing response time reliability in a simple 1-v-1 defensive scenario relevant to rugby football', Journal of Australian Strength & Conditioning, vol. 22, no. 5, pp. 111-115.